Your work here is largely quite well done!

To start, your form intersections are coming along well, though watch out for those curving surfaces. You have a tendency to make their intersections flat, instead of taking into account how those surfaces are curving along a particular axis, as shown here.

Your object constructions are drawn well, though there are a couple things that caught my eye which I'd like to address. Firstly, is the tendency to construct your enclosing boxes to be considerably larger in one dimension than they need to be (such as this one). It seems like you may have started with a box, then purposely cut it in half and moved forward with that. Now, it's possible that you made a mistake, and realized quickly that the proportions were way off, so you split it in half to achieve more appropriate proportions. That would be totally acceptable. I am curious however because this comes up in your computer mouse drawing as well, so I wonder if it is actually part of your process.

One thought is that you might be constructing a cube, then splitting it in two to achieve specific proportions - but this becomes somewhat less useful since you're approximating the cube anyway (we actually get into how to go about drawing an actual cube in lesson 7). So I'm still at something of a loss as to why you're approaching it in this manner, instead of just approximating the overall enclosing box with its appropriate proportions, and moving forward with it even if it's a little off.

Continuing to look at your computer mouse, I can see that you did attempt to employ the technique shown here, but I think one thing to remember is that the plane upright in the center of the construction defines the dead center of your object - meaning it should be lining up with the mouse wheel, as shown here (you can ignore the protruding part from the side for now, we're primarily focusing on the symmetrical section, though this does mean you might not be placing this cross-sectional slice in the center of the construction as a whole).

For this blender, I think the alignment of the two top pieces is somewhat off-kilter. If you look at the minor axis, you'll see that it doesn't actually cut through the center of the box of the middle section. Instead it appears to be based off one of the corners of the base. Make sure you place your minor axes correctly, as these are going to govern how your cylindrical elements fit together.

Oh, actually- I think I realized what happened. That's not a minor axis, that's the corner of all the boxes on top of which each of these forms have been constructed. So to amend my previous paragraph - make sure you're actually using a minor axis in any situation where you need to build up cylindrical forms.

The last issue I wanted to point out is just a general recommendation - when you make a mistake (that is, if you misjudge the size of your encompassing box, or determine that something isn't quite matching your reference image), don't attempt to correct it. So for example, with your spray bottle, you ended up drawing it outside of the container box (at the very least you could have extended that container box and given yourself more structure in which to construct the spray head, rather than just jumping straight into complex forms). There is also the bottom of this toaster where you created a new bottom edge for the form, which no longer respected the same ground plane as the rest of the construction. Always look at construction as a series of decisions being made - once a decision has been set, you can't go back and change it, otherwise you'll introduce contradictions into your drawing, and those contradictions will undermine the viewer's suspension of disbelief.

So! All in all, your work is looking good, you just have a few things to keep in mind. I'll go ahead and mark this lesson as complete.