--- It’s so late. Our son______ be back!--- Don’t worry. I dare say he ______ have some extra work to do.

Living in a fast-paced world, we                  get left behind if we stop learning.

You _______ have told her the bad news last night, because she wouldn’t handle it peacefully.

We _______ play on this road. There is too much traffic. 

What a pity! Considering his ability and experience, he ____ have done better.