Jack used to _____ to school.—-Yes, but now he’s used to _______the bus.

I just can’t stop worrying about the result of my medical examination as I’ve been feeling out of shape for several months.— _____. There is nothing you can do now but wait.

The record about the massacre (大屠杀) is fairly clear and beyond dispute ______ those activities the Japanese soldiers were involved in.

When a new disease breaks out，experts mustwhat to do in the fastest way．

Without proper lessons, you could ___ a lot of bad habits when playing the piano.