Listen！Helen issinging in the next room.—It _____be Helen .She has gone to Beijing.

She ought to stop working; she has a headache because she ________ too long

Though badly _____, the girl remained outwardly calm.

The man____ the shop said we could have two days off

When does your plane take off?—At 3: 00 p. m. tomorrow. I’ve just called the airport to __________ it. [ ]