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. --- My son is addicted to drugs. He isn’t hopeless, is he?
--- Yes, ______ he mends his way and starts all over.

So I’ve included some photos, ____ will help you picture the places I talk about.

The fire destroyed all _______ was in the building.

The government is trying to reduce people’s fear _________ they are likely to be affected by  the nuclear radiation.

It is uncertain _______ side effect the medicine will bring about,although about two thousand patients have taken it.

Children who are not active or ______ diet is high in fat will gain weight quickly.

People were perhaps more honest a long time ago when life was very different from _________ it is today.

.Few people paid full attention to their health conditions _____ they were seriously ill.

As it reported, it is 100 years _____________Qinghua University was founded.

Frank insisted that he was not asleep         I had great difficulty in waking him up.