1.d  2.b  3.d   4.d   5b

C

9.a  10.d

7d   8b

provide-provided-provided

put-put-put

read-read-read

see-saw-seen

sleep-slept-slept

spend-spent-spent

study-studied-studied

take-took-taken

think-thought-thought

travel-traveled-traveled

visit-visited-visited

work-worked-worked

write-wrote-written

8.electronics

9.Physics

10.Math

11.Biology

12.Art

13.history

14.literature

27.Before they came home,I had finished

28.After Jack had left the office,I arrived

29.Before jonh went to bed,he had finished the report

30.After Steven had saved enough money, he bought a new motorbike

i am interested in reading comic books

they are so weak that they cant lift those boxes

đề bài ko có feel a