The manager demanded that the task ______ within a week.

Most people advise that students’ heavy burden __________.

-----Did Mary come to the party?
---I don’t know．She _____while I was out．

I told your friend how to get to the hotel, but perhaps I______have driven her here.

---Why not join us in the game?
---I’d love to, but Mother insists that I _________ all my homework first.

I wonder how he _______ that to the teacher.

— Where is my dictionary? I remember I put it here yesterday.
—You            it in the wrong place.

She insisted that we ________ the source of the river and begin our journey there.

The doctor insisted that the patients _____ in great danger and _____ operated on immediately.

It    be difficult to get a train ticket during traditional Chinese Spring Festival this year because there are many ticket windows.