rst summervocation in the high school, _______I spent a fortnight on the farm, is reallyunforgettable

re than a month passed, real winterhad come, and everything was still clear in his memory as though he ________with Anna only the day before.

下列各句中，没有语病的一句是（ ）

The students found it easyto_______ what the experienced teacher had taught.

The computer system _____ suddenly while he was searching for information on the Internet.