The boy wanted to ride his bicycle in the street, but his mother told him _______.
| A．not to | B．not to do | C．not do it | D．do not to |
--You didn’t wait for Mike last night, did you?
---No, and we____ for him. He didn’t return home at all.
| A．didn’t need to wait | B．needn’t waiting |
| C．needn’t have waited | D．didn’t need wait |
___ is known to all, China will be an _____ and powerful country in 20 or 30 years’time.
| A．That; advancing | B．This; advanced | C．As; advanced | D．It; advancing |
I remember a ____ famous scientist said that we should believe in ourselves first of all.
| A．some | B．certain | C．sure | D．other |
I think you should complain, _____, of course, you are happy with the way things are.
| A．until | B．although | C．when | D．unless |
Rescuers had to _____ the search because of worsening weather conditions.
| A．call off | B．take off | C．come off | D．cut off |