Emergency line operators must always _____ calm and make sure that they get all the information they need to send help.[ ]

Parents ________ good conditions ________ us. We should thank them.

MrSmith wanted to buy the house and he told me that ____the house cost,it would be worth it[ ]

Nowadays many people keep on the move, _____ there to be better-paid jobs. [ ]

The reason for _______ he failed in the exam was that he was too careless.