Fifty dollars for such a T-shirt! You _______ be joking!—I’m serious．It’s made of silk.

Math is difficult for me. How I wish to improve it!－Don’t lose your confidence. I believe you will ______ it if you keep trying.

Though the player is over forty, he can run ___________ some younger players.

Please tell me _____ to improve my English.

________ is it from his home to school?—About 20 minutes’ walk.[ ]