.
--- Could I use your dictionary?
--- ________________.
| A．Go ahead, help yourself, please | B．Yes, you could |
| C．With pleasure | D．It doesn’t matter |
I’m not sure whether I’ll succeed in persuading her., I will try all possible means to make it.
| A．Even though | B．If so | C．Anyhow | D．Instead |
Many scientists believe that global warming , if , will cause extreme climate changes this century .
| A．not stopping | B．no stop | C．not stopped | D．without stop ycy |
John did quite well in his exams ,how little he studied .
| A．consider | B．considering | C．considered | D．to consider |
Although there is no life on Mars now , some scientists think that there some form of life a long time ago .
| A．must be | B．may have been | C．can have been | D．could be |
They were playing in the garden they heard a scream .
| A．while | B．as | C．until | D．when |