We should do more such exercises in the future，I think，_____ those we did yesterday.

You shouldn’t have ________ an appointment with her that you couldn’t ________.[ ]

Is that book so boring—- ______________. You can know a lot about birds.

You shouldn’t have shouted at your mother. It really hurt her. —Exactly. I ________ crazy at the time.

Many a _____ about the poor services of the airline nowadays. [ ]