If nothing _________, the oceans will turn into fish deserts.
| A．does | B．had been done |
| C．will do | D．is done |
I want to explain _______ that prevented me doing it on time.
| A．what was it | B．what it was | C．why was it | D．why it was |
. I_______such a foolish mistake if I had been a little more ca
reful.
| A．wouldn’t make | B．hadn’t made |
| C．wouldn’t have made | D．didn’t make |
_______the tourist discovered his mobile phone stolen, he dialed the police number.
| A．In a moment | B．In the minute | C．For a moment | D．The moment |
. —You ought to have learnt all these sentences by heart.
— , but I forgot everything when I was asked to recite them in front of so many students.
| A．So I ought to | B．So I did | C．So I must | D．So did I |
To regain their_______ after an exhausting game, the players lay in the grass.
| A．energy | B．force | C．power | D．health |