When and where to go for the on－salary holiday ________ yet.

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A．are not decided

B．have not been decided

C．is not being decided

D．has not been decided

－How long ________ at this job?

－Since 1990.

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A．were you employed

B．have you been employed

C．had you been employed

D．will you be employed

Paul doesn't have to be made ________. He always works hard.

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－I failed in the experiment again.

－What a pity! You'd better try ________ the experiment in another way.

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Wind ________ electricity in many parts of the world.

[　　]

A．is widely used to produce

B．is widely used to producing

C．widely used to produce

D．widely used to producing

The boy ________ to me when he said that he had ________ the eggs ________ by the hen into the box there.

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We must not ________ for fear of choking.

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Children should give ________ their seats on the bus if other people are standing.

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With the guide leading the way we were able to travel ________ the forest not ________ air but ________ foot.

[　　]

________ is strange that he is so late.

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