1．Whatever trouble he meets, he is always optimistic(乐观的)．
2．That is definitely(无疑地) the best play I have ever seen all year.
3．We waited and waited.Eventually(结果), the exciting moment we had been looking forward to came at last.
4．Leaves are found on all kinds of trees, so they differ greatly in shape(形状)．
5．It is predicted(预测) that robots will do most of the housework in about 50 years.
