Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
更新时间:2024-11-24 07:51:48 A、assureEach year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.
The association is ________ to raising funds to help the blind.
General Motors, one of the world's largest auto manufacturers, is expanding its ________ in this country.
________ with the size of the whole earth, the highest mountains do not seem high at all.
ItwasthreeBritishsportsmenwho________banneddrugs.
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