I’d appreciate __________ if you could lend me a hand with my homework.

May I have a talk with you , sir ? I have ______important to tell you.

 —What is the man, do you know?—I don’t know exactly. But I think he can be ________ but a teacher.

— Hi, John! I’m going to Greece for my holiday．— Greece? A splendid country, ______ well worth visiting．

—Oh, ________ air is so bad. Shall I open the windows to let in ________ fresh air?—Ok, thank you.