1 . He didn’t catch the bus. That’s ________ he was late for school. (用适当的词填空)

2 . Two years later, Dad started his own business, which wasn't doing so well. That was ______things started to change. (用适当的词填空)

3 . Perhaps this is ________photos are for: to remind us that we all appreciate beauty, that we all share a common desire for pleasure, for connection, for something that is greater than us. (用适当的词填空)

4 . What puzzled me was __________book I should choose. (用适当的词填空)

5 . The problem is __________has got away with the document. (用适当的词填空)