The rivers will become dirtier and dirtier ______ we take action to protect them.
| A．since | B．if | C．until | D．unless |
_______ make a fire with me? They are waiting for us to cook over there.
| A．Let’s | B．What about | C．Why not | D．Why don’t |
The gift shop _______ people, so I stay outside the shop and wait.
| A．is famous for | B．is full of | C．famous for | D．full of |
My mother cooks dinner for us every day. We don’t need to do _______ before dinner.
| A．anything | B．something | C．nothing | D．any thing |
Miss Wang _______ in three days because she is going to see her grandparents.
| A．is back | B．will be back | C．comes back | D．are going to be back |
I _______ some of my free time playing basketball for my school team.
| A．spend | B．have | C．take | D．cost |