`1.` A. take
- Thì QKD: Did
- Did + S + V(o) + ....?
`2.` B. cut
- Thì QKD: yesterday
`3.` D. went/ate
- Thì QKD: last week
`4.` B. drank
- Thì QKD: last night
`5.` B. had
- Thì QKD: yesterday
`6.` to
- go to picnic ở QKD = went to picnic
- Thì QKD: last week
`7.` C. was/sang
- Thì QKD: yesterday
- S + was/were + ...
`8.` A. did/go
- Thì QKD: last weekend
`9.` C. discovering
- S + Spend + time/money + (on) + Ving…
`10.` B. by
- by + phương tiện giao thông
