--- Why should we plant more trees to protect the environment?
--- Because trees can stop the wind from ________ the earth _________.
A. washing ;away
B. blowing; away
C. changing ;into
His sister wanted to have him _____ the radio, but he had had it _____ already.
| A．repair, fix | B．to repair, fix |
| C．repaired, to fix | D．repair, fixed |
Simon likes playing ______ chess, while her brother is interested in playing _____ guitar.
| A．/, the | B．the, / |
| C．/, / | D．the; the |
—I’m very worried about tomorrow’s math test. I’m afraid I can’t pass this time.
—______! I’m sure you’ll make it.
| A．No problem | B．That’s right |
| C．Cheer up | D．Don’t mention it |
-- _____is that man over there?
--- He is a doctor.
| A．Who | B．What | C．Where | D．How |
The patients will have to wait all day ______ the doctor works faster.
| A．if | B．unless | C．whether | D．that |