________, I could not memorize the text.
| A．However hard did I try | B．However hard I tried |
| C．However I tried hard | D．However I had tried hard |
--- Would you mind if I used your bike?
--- ____.
| A．Of course | B．Go ahead | C．Good luck | D．Good idea |
The president spoke at the business meeting for nearly an hour without ____ his notes.
| A．bringing up | B．looking for | C．referring to | D．trying on |
David worked hard at his lessons ____ he gained high grades in the exams.
| A．so that | B．in order to | C．though | D．because |
As a young man, Zhou Enlai ____ the students movements and later ____ the Communist Party of China.
| A．joined; took part in | B．took part in; joined |
| C．joined in; took part in | D．took part in; joined in |
Camels were ____ better than horses for travelling a long distance.
| A．more | B．far | C．quite | D．very |