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

Miss Gao teaches _____ English. We all like her lessons.

No matter how hard he worked, ___ ____

Tom, do you know if Sam ________to my party next week?—I think she will come if she________ free.

My mother didn’t expect ______ such a lovely present from me!