---What’s wrong with you, Jack? You look tired.
---I ________ to prepare for the final exam last night.
| A．picked up | B．woke up | C．stayed up | D．put up |
Although we are young, ______ we can still do something to help them.
| A．but | B．/ | C．and | D．however |
It is necessary _____ something to protect our environment.
| A．do | B．to do | C．does | D．doing |
If it ______ tomorrow, I’ll go hiking with my friends.
| A．won’t rain | B．will rain | C．doesn’t rain | D．rains |
I often see her _______ the piano. Listen, can you hear her _________ the piano now?
| A．play, playing | B．plays, playing |
| C．playing, plays | D．play, plays |
--- I’m sorry I ____ my homework at home.
--- That’s all right. Don’t forget ____ it to school this afternoon.
| A．forgot; bringing | B．left; to bring |
| C．left; bringing | D．forgot; to bring |