根据句意及已给的首字母提示完成单词．

1．I w __________why he hasn’t come yet．Yesterday he promised to arrive by 7：00．

2．I have been working for three hours．Let’s go and get some f _________ air

3．We usually s_________ hands with each other when we meet for the first time in china

4．It’s rude to p__________ at others with our fingers

5．The restaurant can s_________ many people