“Susan, go and join your sister cleaning the yard.” “Why ______? John is sitting there doing nothing.”

I will appreciate       if you paid in cash.

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

－Dad, can I buy _______ of these two T-shirts, they are really cool.－I’m afraid you can’t. You can only have one of them. 

Miss Wilson, whose parents are____ working in China, is studying in Peking University now.