一Whom would you like to be your assistant，Jack or David？ 一If I had to choose，David would be__________choice.

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—It might be a good idea to read some simplified books first. 

Believe it or not, when first (introduce) ____ to Europe, tomato was thought to be poisonous.

Don’t ______ that rope, or you might fall.

It is generally considered unwise to give a child___( )_____ he or she wants.

My camera can be _____ to take pictures in cloudy or sunny conditions. ( )

Scientists say it may be five or six years _____ this medicine is tested on human beings.

It will be a relief over the death of a friend or a relative if the friend or relative dies from ______.

—Who shall I give this dictionary to?—You can give it to ______. It doesn’t matter.

—Hurry up, or we’ll be late.—Take your time. it’s just ______ short distance from here to ______ cinema.

—How long does it take us to go to your hometown from here?—It takes us ______ hour or more to go to my hometown by ______ train.

I think you should end it ______ it is too late, or you will be sorry for it.