"Chúc bn học tốt"
1) arrived / had gone 2) traveled
3) did / do 4) had washed / went
5) used 6) had entered / smiled
7) Did / post 8) had phoned / came
9) graduated 10) had got / saw
11) had done / played 12) didn't meet / had returned
13) hadn't done / got 14) decided / had finished
15) did / say 16) had
17. had left / reached 18) been
19) phoned / had said / went 20) was / had helped
Answer by @Lucyvu, do not copy!
