bai 3:
A.......(1)..........my sister.She is writing a letter......(2)..........new pen.She is writing ....(3).........brother.He doesn t' live here
B.He.....(4)..........a big town.He....(5)............a good job
1.A.see B.see at C.look at D.look
2.A.by his B.with his C.with her D.by her
3.A.to our B.at she C.at her D.to us
4.A.work on B.work in C.works on D.works in
5.A.have B.has C.are having D.is having