.
When it _________ high technology, he is completely at a loss.
| A．refers to | B．comes to | C．happens to | D．speaks to |
I would rather you ____ it.
| A．do | B．did | C．will do | D．would do |
Should it rain, the crops _____ .
| A．would be saved | B．would have been saved |
| C．will be saved | D．had been saved |
--- “What will you do during the summer holiday?”
--- “I don’t know, but it’s high time _____ something.”
| A．I’m deciding | B．I’ll decide | C．I decided | D．I decide |
It is important that we _____ wild animals.
| A．will protect | B．should protect | C．shall protect | D．are protecting |
The teacher demanded that the exam _____ before eleven.
| A．must finish | B．would be finished | C．be finished | D．must be finished |