16[单选题,1.3分] If the market is left ____________, there will sometimes be shortages or over-production.

17[单选题,1.3分] It is not who is right, but what is right ________ is of importance.

12[单选题,1.3分] ________ he known that it was to be the president’s last press conference, he would have filmed the occasion.

5[单选题,1.3分] It was _____ and she did not know enough to analyze each problem properly.

[单选题,1.3分] I’m afraid we can’t have coffee; there’s _____ left.

[单选题,1.3分] His income is double _____ it was five years ago.

[单选题,1.3分] Oh, how beautiful it is! I like _____ better.

[单选题,1.3分] I left my pen on the desk and now it’s gone; who ________ it?

[单选题,1.3分] I ________ your last point — could you say it again?

单选题,9分] Scientists say it may be five or ten years _______ it is possible to test this medicine on human patients.

【单选题】They do it _ the knowledge or help of their partents.

全国抗战爆发后，许多高等院校向大后方迁移，内迁的北京大学、清华大学、南开大学在昆明组建成了“西南联大”。