Does David have a ping-pong ball—________. But he has some tennis balls.

－Good afternoon，class.－_____ , teacher.

____ the end of the performance did theaudience get the chance to take photos with the respectable actor．

Alice is stubborn, as you know. She trusts you and only you can ____ her to give up the foolish idea.

You never know how much difficulty we had _________________ the problem. Luckily, we try to solve it with Mrs Wu’s help.