---He’s already back to Australia,___________?---________, he is on a visit to Shanghai.
—Can he _______ anything about Canada? —No, he can’t. All of us except him _________to Canada.
We students can _______ food and old clothes to the homeless people, and the teachers can __________ learning skills for the poor children.
Which of the following signs can’t be found in a hospital?
—Our school is so big. We must clean it up as soon as possible. —Don’t worry. ________.
-Hello, Jenny. Your box looks so heavy. Let me give you a hand. -_______I'm OK.