What should I do when the earthquake happens, Dad?—First of all, it’s important to _________ and hide yourself in the corners of the room.

Look at _____boy over there. Do you know him?—Yes. He is from Shanghai .

Can you work out the maths problem? —Sorry, I can ______ understand its meaning.

____ do you clean the classroom?— Three times a day.

John asked Tom ____ give him a lift to the office.