Daniel doesn’t know who _______ this history book.
Mum ________ clothes, so I have to look after my younger sister.
There ________ a pencil and two pens on the desk.
—Why are you still watching TV? Please go and do your homework.—I ________ it. Can I watch it for another ten minutes?
Flowers and trees ________ every year. Now our city is getting more and more beautiful.
—The story is not easy for students to understand. —I agree with you, ________ it’s not very long.