Mike usually spends ______ time doing homework than Jack.

______ nearly all behavior is learned behavioris a basic assumption ______ has been put forward by the social scientists.

The classroom is ________ for fiftystudents.

Last year, he wrote to tell me that he ______ his new dance. But I ______ of him ever since.

The Chinese exploration ship will join in the search for______ seemed like parts of the missing plane.