_____ a reply, he decided to write again.
| A．Not receiving | B．Receiving not |
| C．Not having receiving | D．Having not receiving |
Auckland is a most exciting city with people of many different cultures____ there.
| A．live | B．having lived | C．lived | D．living |
The time is drawing near_____food raised in space will directly benefit humans below.
| A．where | B．when | C．whether | D．why |
．Play, often seen as______ activity for kids, is still important in____development of teenagers.
| A．the; the | B．an; the | C．an; 不填 | D．the; 不填 |
A big step____to strengthen China’s health care systems since we launched an effort in 2008.
| A．has been taken | B．is being taken | C．was taken | D．had been taken |
．---Let me help you cross the street.--______! I’m not that old.
| A．Take your time | B．No way | C．Come on | D．Go ahead |