—When shall we go planting trees in the hill?
—______ it begins to rain, so they don’t need watering.
| A．Not until | B．While | C．Till | D．Unless |
The possibility __________ pleasant smells might reduce pain has recently been suggested by new research.
| A．where | B．what | C．which | D．that |
Thanks to _____ help from his teachers and classmates, he has made _______ rapid progress in his studies.
| A．不填；a | B．the; 不填 | C．the; a | D．a; the |
– Shall we invite Jim and his sister to our party?
– ______. They’ll have fun with us, I think.
| A．No way! | B．Why not? |
| C．Good for you! | D．What for? |
If penicillin had not been available, many people _____ from sickness or even small wounds.
| A．would die | B．would have died |
| C．will have died | D．might die |
The Japanese government stubbornly claimed the ownership of Diao Yu Islands belonging to China, ______ greatly hurt the friendship between the two peoples.
| A．that | B．what | C．which | D．it |