My laptop computer, _______ I can’t go on with my work, broke down the other day.
| A．for which | B．which | C．without it | D．without which |
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 |
I can’t thank him too much, ____________ I couldn’t have finished the project in time.
| A．without his help | B．with his help |
| C．without whose help | D．with whose help |