1.was found

2.enjoyed-hitted

3.watched-decided

4.expanded

5.took

6.will go

7.hadn't visited

8.have ever travelled

9.to send

10.were-would go

chúc học tốt <3!

=>
1. was found
-> bị động QKĐ was/were V3/ed
2. were enjoying/hit
-> QKTD when QKĐ
3. had watched/decided
-> QKHT (hành động xảy ra trước hành động khác trong quá khứ)
4. has expanded
-> over the past few years (HTHT, S have/has V3/ed)
5. took
-> in December 2019 (QKĐ, S V2/ed)
6. is going
-> this summer (HTTD -> dự định/kế hoạch)
-> together with (động từ chia theo chủ ngữ thứ nhất)
7. hadn't visited
-> câu tường thuật (lùi thì) 
8. will ever travel
-> think/in your lifetime (TLĐ, S will V)
9. to send
-> plan to V : dự định/lên kế hoạch làm gì
10. were/would go
-> Câu đk loại 2 If S V2/ed, S would V