Students often ______ a lot of difficulties when they communicate with foreigners for the first time.

If the service is awful, a customer has the right to _____ to the manager. 

As there was no spare bedroom, Susan had to ______ her friend for a night in the sitting-room.

Our teacher has _________ some very difficult questions to ask us.

Quite a few problems_____ after the new examination system was introduced, and the number of students in this school _____by 5% Last year.