Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
A
A 可行的、可能且合理的 B 不可相信的、难以置信的 C 时髦的、时尚的 D 贵重的、宝贵的
______ is recognized as the national flag-carrier.
Whycouldn’tyou________ananswerwhenIaskedyouwhyyouwerelate?
The visiting minister expressed his satisfaction with the talks, ________ that he had enjoyed his stay here.
Bythemiddleofthe21stcentury,thevastmajorityoftheworld’spopulationwillbelivingincities_______inthecountry.