—Some Chinese students find it hard to get used to the life in London. —Exactly, ______ they’ve learnt a lot about the city before.
Nobody ____to smoke in the cinema.
The air in big cities _____very dirty by factories.
The number of people invited _____fifty, but a number of them _____absent for different reasons.
All but one ____here just now.
Father went to his doctor for ____about his heart trouble.