$\text{27.}$ A 

→ Be + S + able to + V-inf + O ? 

→ Tạm dịch : Khi nào anh ấy có thể kết bạn với người nước ngoài? 

$\text{28.}$ C 

→ a/an/the + (adj) + N 

→ Tạm dịch : Em gái tôi có một bộ sưu tập vòng tay đắt tiền.

$#Keisha$

27. When/ with/ make friends/ he/ to/ was/ able/ foreigners/?

A. When was he able to make friends with foreigners?

B. When he was able to make friends with foreigners?

C. When was able he to make friends with foreigners?

D. When was able to he make friends with foreigners?
28. My sister/ an/ has/ of/ expensive/ collection/ bracelets.
A. My sister has an expensive collection of bracelets.
B. My sister has an collection expensive of bracelets.
C. My sister has an expensive bracelets of collection.
D. My sister has expensive bracelets of an collection.