—I wonder ____.
—Yes, of course.
| A．where we can buy the parts |
| B．how often you hear form your sister |
| C．if I may have a word with you |
| D．why he arrived late yesterday |
He found ____ very difficult _____ the problem.
| A．that; to work out | B．this; working out |
| C．himself; work out | D．it; to work out |
—Which sweater can you choose, the blue one or the red one?
—____ is OK, I think. Both go well with my trousers.
| A．Both | B．Either | C．Neither | D．None |
Many more trees should ____ this year.
| A．plant | B．be planted | C．planted | D．be plant |
—____ the workers are very tired, ____they keep on working.
— They are great. We must learn from them.
| A．Because; / | B．Though; / |
| C．Because; so | D．Though; but |
If Tony_____ to the corner this weekend, Bob will join him.
| A．has gone | B．are going | C．goes | D．went |