We believe scientists will ________a way to solve the problem of air pollution.
| A．set off | B．put off | C．come up with | D．catch up with |
We are glad to hear that the Greens_________to a new flat next week.
| A．moved | B．moved | C．will move | D．have moved |
Now my father_________his bike to work every day instead of driving.
| A．ride | B．rode | C．rides | D．will ride |
By the end of the last month, I_________all the CDs Of Justin Bieber.
| A．collect | B．collected | C．have collected | D．had collected |
— How long_________in Hong Kong?
— For just the weekend. I’ll be back next Monday morning.
| A．have you stayed | B．are you staying | C．did you stay | D．do you stay |
My command of English is notyours.
| A．as half as | B．so half good as |
| C．good as half as | D．half so good as |