How do you think _________that he was an hour late on such a short journey?
| A．it came about | B．did it come about |
| C．it was come about | D．was it come about |
----- What do you think of my paper?
----- The _______ part is well written but the latter is just so-so.
| A．primary | B．former |
| C．late | D．latter |
I _______ use a clock to wake me up because at six o’clock every morning the train comes by my house.
| A．couldn’t | B．mustn’t |
| C．shouldn’t | D．needn’t |
A number of tests have been conducted to _______ that these drugs have no side effects.
| A．find out | B．look for |
| C．make sure | D．work out |
Every year, typhoons and losses ______ lead to are frightening though measures have been taken.
| A．which | B．that | C．they | D．ones |
The managers discussed the plan that they would like to see __________ the next year.
| A．carry out | B．carrying out |
| C．carried out | D．to carry out |