27. Mr. Bush is on time for everything. How ________ it be that he was late for the opening ceremony?
| A．can | B．should | C．may | D．Must |
The car's________ has improved a lot since a new engine has been applied to it．
| A．character | B．performance |
| C．appearance | D．attraction |
How________ you expect to get something in return when you never willingly lend a hand to others?
| A．shall | B．can | C．should | D．dare |
--- Alice is moving to her new apartment next Saturday． --- I would be glad to help her，________ need some help．
| A．if she might | B．if she will |
| C．if she | D．should she |
________that the government can clear up official corruption，we are________ about the future of our country．
| A．Convinced；optimistic | B．Convincing；optimistic |
| C．Convinced；pessimistic | D．Convincing；pessimistic |
General Secretary，Xi Jinping stressed that cross－strait cooperation would be strengthened________ the two sides could agree to oppose Taiwan independence．
| A．unless | B．even if |
| C．as long as | D．until |