The volunteers would rather go by train than ________.

There is a growing body of evidence to support the fact that most people suffer from a lack of daydreaming _______ an excess of it.

The engineer ______ my father works is about 50 years old.

The other timing system belongs in our internal clocks，which，left ________，would tie the body to a 25-hour rhythm.

_______ for the free ticket, I would not have gone to see film so often.

Younger children are curious ________ how things work ，and many of them want to take apart everything within their reach.

I asked him to ________ me a few minutes so that we could go over all the problems.

_______ is a fact that English is being accepted as an international language.

The old couple have been married for 40 years and never once _______ with each other.

Country life is better than city life ________ it offers fresh air and noiseless environment