1．You didn’t let me drive. If we ____________(轮流驾驶), you wouldn’t have been so tired.(drive)
2．If he ____________(采纳了我的意见), he would be a scientist now.(take)
3．Don’t be discouraged. ____________(你得学会如何承受压力)．(live)
4．____________(在他的朋友的帮助下), he collected enough money.(aid)
5．The tickets ____________(有效期只有一个月)．(available)
