－We will play football _________Class 4 tomorrow. －Good luck.

That’s the new machine ________ parts are too small to be seen.（）

en took the little key, and opened it, trembling, but could not at first see anything ________, because the windows were shut.

Not only _________ hard but _________ also kind.

Mr. Lee, who asa guide for over 10 years, is now a manager in a big travel agency.