To lose weight, Mr White______ hiking as a regular form of exercise after he retired.

There is _________ thing as a free lunch.

How come you stepped into the lab with your shoes on? You’re ________to take them off before you enter it. I told you so.

They became good friends during the war, and since then their lifelong friendship has _______ tests of life and death.

We were supposed to move into our new classroom building at the beginning of this month，but things didn’t ________ as planned.