Since William had been seriously ill for several months, his parents were worried about________ to return to school full-time.
A、hewantedD
暂无解析
As you like pop music, __________ I like literature.
The engine has broken and the boat is ______ on the water.
Human behavior is mostly a product of learning ________ the behavior of animals dependsmainly on instinct.
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
Theenginehasbrokenandtheboatis______onthewater.
