Ⅰ.单句语法填空
1．The engine just won't start.Something seems ________(go)wrong with it.
2．When he was walking home from the office that night，he ________(attack)by several robbers.
3．A completely new situation will arise when the examination system comes into ________(exist)．
4．He is seriously ill so that he is unlikely ________(attend)the party.
