You never know how much difficulty we had the problem. Luckily, we managed to solve it with Ms Zhu’s help.
| A．working out | B．work out |
| C．worked out | D．to work out |
Chinese is one of ______ subjects in our school.
| A．more important | B．the most important |
| C．important | D．importantest |
I was watching TV ______ my mother was writing an e-mail to her friend.
| A．as soon as | B．after | C．until | D．while |
We must study hard so that we can get a good job when we ________.
| A．take care | B．speak up | C．set off | D．grow up |
David worked _______ a waiter in a restaurant in his part-time.
| A．to | B．as | C．from | D．before |
_______ she is in trouble, her friends will help her out.
| A．Before | B．Whenever | C．Although | D．Because |