1, because the air isn't pure
2, Although she is poor, she is always happy.
3, who took me to the airport was very friendly.
4, should sing a song.
5, putting garbage bins around the schoolyard.
6, Although she is ill, she goes to work
7, who applied for the job speaks English very well.
8, which we listened to last night was good
#chúc bn học tốt#