The play had already been on for quite sometime when we _______ at the New Theatre.

How’s your tour around the North Lake? Is it beautiful?— It ______ be, but it is now heavily polluted.

“How many students are there in your school” “ the students in our school ______over two thousand.”

The terrorists（恐怖分子）in Xinjiang ______ last month.

I don’t know if he __________ tomorrow . If he _______here , I will call you .