_____ what I said to him, he refused to follow my advice.
| A．Regardless of | B．Assuming that | C．In vain | D．Even though |
There are lots of plastic bags ____ in the river, ____ it very dirty.
| A．floating; making | B．to float; made |
| C．being floated; made | D．floated; making |
--- 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 |