A successful scientist needs _____ if he wants to make hypothesis (假设) of how processes work and how events take place.
| A．permission | B．penetration |
| C．imagination | D．convention |
The sports meeting will be held on the playground this weekend, if weather______.
| A．permits | B．promises | C．agrees | D．allows |
—I’m afraid I have to give it up.
—Remember ______ sticks to his work will succeed one day.
| A．who | B．whom | C． whoever | D．no matter who |
Do you have any idea ______ on earth has happened to our friend?
| A．that | B．what | C．as | D．which |
A big bush fire ___in Australia last night, but fortunately everyone ____escape.
| A．took place; could | B．happened; can |
| C．broke out; was able to | D．happened; could |
________ she couldn’t understand was ________ fewer and fewer students showed interest in her lessons.
| A．What；why | B．That；what | C．What；because | D．Why；that |