Scientists are convinced __________ the positive effect of laughter _________ physical and mental health.
| A．of; at | B．by; in |
| C．of; on | D．on; at |
_______ is known to us all that the old scientist, for _______ life was hard in the past, still works hard in his eighties.
| A．It; whom | B．As; whom | C．As; whose | D．What; whom |
They urged the students _______ the work on time.
| A．finishing | B．to finish | C．finished | D．have finished |
In the reading room, we found her _______ at a desk, with her attention _______ on a book.
| A．sitting; fixing | B．to sit; fixed | C．seating; fixing | D．seated; fixed |
----- I’m not good at basketball, you know.
----- _______ We’re playing for fun. Just try and you’ll see you can do it.
| A．Well, it depends. | B．Take your time. | C．Come on﹗ | D．That’s OK﹗ |
They desired they _______ the right to express their opinions.
| A．had | B．have | C．are | D．were |