When ________ by a CCTV reporter how he felt about his failure in the match, he simply said he would be back.
| A．ask | B．asking |
| C．to ask | D．asked |
Clearly, in a system _________ every decision is made on the basis of tradition alone, it may be difficult to achieve progress.
| A．that | B．when | C．where | D．which |
Suddenly it _________ to me that I should report the accident to the police.
| A．happened | B．struck | C．occurred | D．hit |
The following chapters provide step-by-step instructions for practical _______ of genetic (基因)engineering to agriculture.
| A．applications | B．organization | C．expression | D．attention |
What a moving _____to see so many people offer help to these in danger!
| A．sight | B．scene | C．view | D．scenery |
—Please let me know where David is. I couldn’t find him anywhere.
—Well, he _____have gone far—his coat’s still here.
| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |