1．The problem_______________(会上讨论过的)is very important.
2．You should________________(让你自己被人听到) when speaking.
3．She ________________(发现项链不见了) on her way home.
4．When we ________________ (看见这条路被阻断) with snow, we decided to spend the holiday at home.
5．Later they found that they ________________(迷失在森林中)．
