Fill in: and, but, because, so, then or when.
1 The door not locked, ... Mike opened it and went inside.
2 First, the sky turned grey, ... it began to rain.
3 We waited for Rob's answer, ... he said nothing.
4 Liz was in the kitchen ... the phone rang.
5 Mr Grant opened the letter ... read the message inside.
6 Mandy felt nervous ... the dog looked very scary.
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