1at first people were calm, but later / after
they became angry.
2 the rescue services arrived at the scene
as soon as / while they could.
3 the passengers finally / then arrived in london.
the train stopped, then / at first the lights
went out.
when / while the train stopped, people
weren't worried.
after / then the incident, the train company
apologized to the passengers.
B: Yes, it is. If it b) was frozen, we could have gone skating.
2 A: Haven't you got enough money for a holiday?
B: Oh yes. I've got some saved up b) in case I suddenly need it.
3 A: What are you going to do next year?
B: I wish I a) knew the answer to that question.
4 A: These figures are too complicated to work out in your head.
B: Yes, if b) only we had a calculator.
5 A: What are you doing later this afternoon?
B: Oh, b) in case the game finishes, I'll go home, I expect.
6 A: Do you think I should take the job?
B: You shouldn't do anything c) unless you think it's the right thing to do.