1 . He was bitten by a poisonous snake. We______（必须）squeeze out the poison as soon as possible. （根据汉语提示单词拼写）

2 . As the chief editor, I ________(必须)admit that there have been some printing errors in the newspaper.(根据汉语提示单词拼写)

3 . It ________(一定是) be bad manners to keep your cell phone ringing on formal occasions. （根据汉语提示单词拼写）

4 . All the delegates________ (必须)participate in the election and vote for their president. (根据汉语提示单词拼写)

5 . Why ______________(一定要)you do everything as if you have to win? （根据汉语提示单词拼写）