选择下面方框中所给的词或词组填空完成句子，使其完整与正确。

1．Be _____! The tea is too hot．You'd better not drink it right now．

2．Thomas Edison had more than one thousand _____in his life time．

3．Great changes have _____ in Urumqi in the past few years．

4．I can't hear you clearly．Would you please speak more ______?

5．The blue pencil isn't mine．It _______ Mary．