-What do you think of Peter?-He is a helpful person. He is always helping people without expecting anything_______.
The name of our country is PRC, which _____ the People’s Republic of China.
He came back late, _____ which time all the guesses had already left.
Because so many visitors are visiting our school today, some teachers have to _______ guides.
She thinks only of herself; she doesn’t _____ other people.
—Peter didn’t come to the meeting this morning. — I _______ him yesterday, but I was too busy and forgot it.