﹣Why not （join）an English club to practice your English？
﹣Good idea!
Do you think there'll be any cheese left？
it． （doubt）
在空白处填入一个适当的词，使句子意思完整、语法正确．
You're supposed to at the door and wait before entering the office．
If you are helpful， you can on well with everyone around you．
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