A survey of health researchers ______ that four hours of exercise every week ____ good for our health.
第一部分:单项填空(共35小题:前20题每题1.5分,后15题每题1分,共45分) ----- Can I speak to Mr. Wang, please? ----- __________.
20.He took much pain-killer last night, thus ______ his headache.
19.China is a great country with a long history, ______ we all know it.
18.Development of economy ______ which our country attaches great importance, has drawn the attention of the whole world.
17. ______ others might have been satisfied, Dawson had higher ambitions.