Everyone must __________ the security check (安检) before getting on the plane at the airport.— Yes. It’s necessary to ensure the passengers’ safety.

is surprising to us is that Tom, for _______English was once boring, can speak English fluently as though he were a nativespeaker

Guess _______ yesterday —I think you went to the cinema.

Many of us have a bad opinion of him, but he ____________ by his leaders.

The chains might break but that’s a chance I’ll have _____.[ ]