The last few years ________ many natural disasters around the world, from drought to earthquake.

Mr. Wang ____ two boys to send the sick boy to the nearest hospital

He is a financial manager in Wall Street now, but nobody knows he _____ part-time jobs here and there for survival for eight years.

I won’t tell the student the answer to the math problem until he ____on it for more than an hour.

Paul didn’t want to put on the coat. He said that he _________ by his friends.