It is necessary that the students ____ more excercises to do.

The teachers’union _________ a lawsuit against the district calling for repairing “deplorable” school conditions.

Faced with rapid inflation and _____ international and home markets, many firms havedeclared bankrupt.

All their __ have been shown up by their own deeds.

At ______, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.

Arriving at the bus stop, _____ waiting there.

It’s important_____ a foreign language

____ before we depart the day after tomorrow, we should have a wonderful dinner party.

We expect Mr. White will ____Class One when Miss Jane retires.

Due to the bad weather the plane was ____ for two hours.