Hoàn thành câu sau:

1.There are some chairs and a table in the kitchen.
->We have...
2.Not many people can understand his lecture.
->Only...
3.It is wrong of us to throw rubbish.
->We mustn't...
4.It is necessary for us to be present at the class discussion on Saturday.
->We must...
5.The tour guide tell us not to throw rubbish.
->The tour guide says that we..