Tony is very nice. He is the most enjoyable person I .

It’s already twelve o’clock, and he ____________ have been here half an hour ago.—Maybe his flight was behind time.

You can pay weekly or monthly.—It’s _____ you[ ]

The United Nations ____ an international organization that tries to find peaceful solutions to world problems.[ ]

We should help our parents do some housework.The main structure of the sentence is _______.