—I don’t think I’ll be able to go mountain-climbing tomorrow.— ?
The first thing ________ we should do is to master the basic grammar.
Diamond, _________, is the hardest of all materials.
He is not such a man ________ cares for himself only.
—Tomorrow is a holiday. Why are you doing your homework now?—I am doing these exercises so that I won’t have tomorrow.l
I like getting up early in summer. The morning air is good .