The doctor tried to do an experiment to find out the （ ） of the medicine on the mice.

（ ） weather may be too hot to the tourists.

Whenever we planned our vacations， mother could always offer some _____ suggestions.

The tall tree, （ ） leaves are darker than those of the other two, is as old as grandpa.

It was in New Zealand _____ Elizabeth first met Mr. Morris.

The company has （ ） heavy financial losses over the last two years.

No one should blind himself （ ） the well-known fact.

A good teacher must know how to （ ） his ideas.

Hardly （ ） how I passed the interview.

_____ forget the days when we lived in the countryside.

The most important is not_____ you do, but_____ you do it.

（ ） does it take you to wash all the dishes?