Many people put down their own jobs and joined us a missing child.
| A．to search | B．in searching | C．in search of | D．to search of |
for the fact that she got hit by a car and broke her leg on her way to school, she might have passed the exam.
| A．Hadn’t it been | B．Had it not been |
| C．Was it not | D．Were it not |
Hesitating what to do,.
| A．so let’s not go outing | B．we had to stay home |
| C．the tour was cancelled | D．but we should still take the tour |
The retired man donated most of his savings to the school damaged by the earthquake in Yushu, _______ the students to return to their classrooms．
| A．enabling | B．having enabled |
| C．to enable | D．to have enabled |
He spent at least as much time reading as you online yesterday.
| A．had to chat | B．did chatting |
| C．do chatting | D．had chatted |
--- Why does the lake smell terrible?
---Because large quantities of water .
| A．have polluted | B．is being polluted |
| C．have been polluted | D．has been polluted |