These tickets for the performance are （ ） until the end of the month．

The first question we will discuss is _____ we should go there so early tomorrow.

If I had remembered （ ） the window, the thief would not have got in.

_____ finished his work, he had to stay at home on the weekend.

（ ） some mammals came to live in the sea is now known.

—Shall we invite Tim? —No, it’s too late to invite any more people. _____, he hates parties, you know.

Kim went to visit the teachers in the primary school ______ he worked three years ago.

As population increases, （ ）.

At the 60th anniversary, the guests sitting in the front are those ______ graduates from the university.

_____ that the earth was flat?

He had never given a speech to so many people, so he felt（ ） .

If you don’t agree with me, （ ）.