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在下列各句的空白處填入一個最適當?shù)脑~，使句子意思完整、語法正確。

1．His grandpa is __________. He can’t hear anything.

2．In e-mail English, a happy face is made with a colon and a right bracket __________ it.

3．You aren’t supposed to __________at others with your chopsticks.

4．---Thank you very much for helping me.

    ---It’s my __________.

5．Li Yundi learned to play the piano by __________ at a very young age.