—________ is this T-shirt?—Thirty yuan.
Cindy is always helpul. She only thinks of others and does not_____herself.
— Jim, what did I say just now?— Sorry, I ______ of something else.
The boy looked __________ because he didn’t pass his maths test.
I think there will be _____ people and ______pollution.
-- Must I do my homework right away?-- No, you _____. You_____ do it later.