Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
| A．of; at | B．by; in |
| C．of; on | D．on; at |
In a way I can see what you mean , even though I don’t ___ your point of view.
| A．agree | B．permit | C．recognise | D．share |
Which of the following is right?
| A．She said that I was here a few weeks ago. |
| B．She said she was there a few weeks ago. |
| C．She said that I have been there a few weeks ago. |
| D．She said she had been there a few weeks before. |
We should ______ the achievements and correct the mistakes.
| A．add in | B．add to | C．add up | D．add up to |
You will be successful in the interview ______ you have confidence.
| A．before | B．once | C．until | D．though |
The factory was built in a secret place, around ____ high mountains .
| A．which was | B．it was |
| C．which were | D．them were |