— I can’t decide __________or not I should encourage my son to be a volunteer.
— Why not? It will make him more helpful.
| A．if | B．whether |
| C．how | D．why |
Xi’an is a city with many places of interest and _____ tourists come here every year.
| A．thousand of | B．thousand |
| C．thousands | D．thousands of |
—_____ you _____ your homework yet?
—Yes, I _____ it ten minutes ago.
| A．Did; do; finished | B．Have; done; have finished |
| C．Have; done; finished | D．Will; do; finish |
It’s necessary for you _____ exercise every day.
| A．taking | B．to take | C．take | D．takes |
—Could you tell me _____?
—Sorry, I don’t know.
| A．where are my socks | B．where can I find my socks |
| C．where my socks are | D．where my socks put |
The Greens _____ China for seven years.
| A．have come to | B．have been to |
| C．have come in | D．have been in |