17. I have studied English since 5 years
A B C D
18. When was he a student, he used to hating chemistry biology and physics.
A B C D
19. Mr Ba rides his bike to work at the moment
A B C D
20. The house built on the river bank twenty years ago.
A B C D
21. You're tired although you stayed up too late to watch TV last night.
A B C D
17 since => for
18 hating => hate
19 rides => is riding
20 A => was built
21 although => because