It is difficult to understand this kind of _______ calculation.

I only called the police when I ________ everything else.

Weather _______, we ’ll go out for a walk.

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

The general sent out word that no one in the bunker ________ to bed until further orders.

______ inns and taverns,in particular,gained a reputation for cleanliness and comfort and set the standard for accommodation in other parts of Europe.

There is a deadlock(僵局) in the discussion when neither side gives ________ to the other.

This is ________ good reading habits are not only an important study skill for the student, but also an important life skill for anyone.

By "language acquisition is primarily the acquistion of the grammatical system of language", linguists mean that ______.

This is an important problem _______ too few social scientists have researched.