There is ____ “u” and _____ “s” in ____ word “useful”.

Let’s __________ dinner together.

The famouse writer Lin Qingxuan ______to come to our school to give a speech again.

Tom wants to know if you _________ a picnic next Sunday.– Yes. But if it ________, we’ll visit the museum instead.

There are so many apples ___ that tree. [ ]