10. Your daughter has a good voice. Her interest in singing …………………. encouraged.

A. should be B should C. be D. have

11. I found this book on my desk when I came to class. It must ……. by one of the students in earlier class.

A. be left B. have been left C. leave D. have left

12. You had better ………………….your chores before Mom gets home.

A. be finished B. have finished C. have been finished D. finish

13. These books will have to …………………. to the library tomorrow.

A. return B. have returned C. being returned D. be returned

~Học tốt nhoa~

$\text{10.Should be}$

$\text{(Pasive voice với Modal verbs:S+Should/Must...+be+Vpp)}$

$\text{11.Be left}$

$\text{(Như câu 10)}$

$\text{12.Finish}$

$\text{(S+Had Better+(not)+V(bare))}$

$\text{13.Be returned}$

$\text{(Pasive voice với thì Tương Lai Đơn có Modal verbs:}$

$\text{S+Will have to+be+Vpp)}$

$\text{@TriLeCongTri}$

$\text{chúc em học tốt!!!!!!}$