At present, what _____ most heavily on American people is the terrorist accident(恐怖事件).

Britain is being ________ in the race for new markets.

Do you know where the headmaster is? I have something urgent. — Oh, he ____ have gone far, for the computer is still on in the office.[ ]

The discovery of the oil field, to the delight of the whole nation, will largely _______ the country’s dependence on imports of energy

When you leave the room, please______ the light.