Sometimes most of us probably are angry ______ our friends, parents or teachers. [ ]

Life _____ a pig isn’t always perfect.[ ]

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

Where is Sally, Jack?—She _________. She wants to be a swimming player.

If you can’t decide which of the two novels to borrow, why don’t you take_____? —- I won’t read them this month.