The director was ________ of the way we were doing the work, which made many of us frustrated.

The purpose of a tariff is to _______ imports to protect domestic industry.

The English language contains a ________ of words which are comparatively seldom used in ordinary conversation.

It is a serious crime that people smuggle goods out of China to ________ paying customs duty.

One of the responsibilities of the Coast Guard is to ________ that all ships follow traffic rules in busy harbors.

You are not allowed to take a second job unless your employer gives you __________ .

Peter will take over as managing director when Bill ________ .

Fresh fruits and vegetables are generally less ________ when they are in season.

He _________ very quickly after his illness.

I hate people who ________ the end of film that you haven’t seen before.