Sorry, Mr. Wang. I didn’t finish the assignment yesterday. Oh, you ________ have done it as yesterday was the deadline.

There are many people in the park. Some are walking along the lake. _________ are sitting on the grass.

Hi, Peter! Tomorrow is mum’s birthday. What are you going to buy ______ her—I’m going to buy her a scarf.

With economy developing at great speed, our city has _____ quite a few changes in recent years

The whole nation watched the two candidates________theissue of raising taxes on TV.