根据句意及汉语提示完成句子 1.Do you know when computers ____

根据句意及汉语提示完成句子 1.Do you know when computers ____
根据句意及汉语提示完成句子
1.Do you know when computers _____________________________(发明)?
2.This machine _________________________(用来)making noodles.
3.The festival ____________________________(发生) in October evry year.
4.I met my English teacher ___________________(偶然) yesterday afternoon.
5.An apple ___________________(掉进) the water