If his parents are convinced _____the fact that his son always focuses his mind _____his study.

There are 40 students in our class. ______ of them, about 35, sleep 8 hours every night.

e boxes are too heavy for me to move— Here, I’ll give you a hand ____them

The window is dirty.—I know. It ______ for ages and I’m consideringgiving the task to our children.

The black characters really________on that orange background.[ ]