We believe ________ we can find out the wonder drugs to H7N9 bird flu.
| A．when | B．whether | C．what | D．that |
___________ returning from abroad, he set about setting up a club for young climbers.
| A．Upon | B．At | C．In | D．During |
In his twenties, he took part in sports and gained a great deal of __________.
| A．ability | B．study | C．experience | D．knowledge |
If you want to _________ university, you should work hard.
| A．attend | B．join | C．take part in | D．join in |
The captain commanded that the mission ______ before dark.
| A．must be finished | B．be finished | C．ought to be finished | D．was finished |
The room is too small and it is not fit_________.
| A．to be worked in | B．to work in | C．to work | D．to be worked |