Can't be could / switch might not/be might / throw
must be must leave must / miss
look at
guesse
b: it?
a: oh no. a traffic jam. there must have been an accident.
an accident. i was once on a motorway
and a lorry was on fire.
a: how did that happen?
b: i don't know. someone 3
la cigarette from a
bridge. it 4
_ a very big fire because the lorry
was okay when we finally passed it but the road was
closed for ages.
n
he roof:
ere. must/
w
a: where's dan? he's late.
b: he 5
_his bus. why don't you phone him?
a: i tried but there's no answer. he 6
it at
home.
b: or he 7
it off. you know dan. he switches it
off in school and then forgets to switch it on again.
1/ fly
stairs. may/
