Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on; at |
They considered___ a computer, which was considered ___ a great help in their work.
| A．to buy；to be | B．buying；being |
| C．to buy；being | D．buying；to be |
The natural beauty of Mount Tai _______millions of tourists from all over the world every year.
| A．encourages | B．attracts | C．reminds | D．seizes |
________the good old days，he couldn’t help smiling.
| A．Looking back at | B．Looking on |
| C．Looking forward to | D．Looking into |
What great fun the children had____ basketball! I didn’t have the heart to stop them.
| A．to play | B．playing | C．play | D．played |
－________I forgot to watch the football game on TV yesterday evening.
－Not to worry. I have recorded it.
| A．Excuse me! | B．What a pity! |
| C．How come? | D．Sorry for you! |