______ don’t use gas（汽油）．
| A．Jeeps | B．Bikes | C．A fire engine（救火车） | D．Cars |
Is the cat ________ the door? No, it isn’t. It’s ________ the desk.
| A．behind, under | B．in, on | C．under, at | D．over, behind |
If I ____ you tomorrow, I will give you the receipt.
A. see B. will see C. am seeing
—— What day is today? —— It's ______.
A. Monday B. a fine day C. September 1st
The students couldn't help ______ when they heard the joke.
A. to laugh B. laugh C. laughing
Do you know ______ this word?
A. what to spell B. how to spell C. to spell