Cho \(\Delta ABC\), \(\widehat{A}=90^o\). Lấy \(D\in AB,E\in AC\). Chứng minh \(DE< BC\).

Mk cần gấp nội trong tối nay ạ!!!!! Hình ko cần phải vẽ đâu.

I. Choose the best answer:
1. “If you are not satisfied ______ your purchase, we will give you a full refund.”

A. at B. of C. for D. with

2. College students are becoming less dependent ______ their teachers.

A. on B. of C. with D. to

3. Helen is traveling to Germany tomorrow on her first

working trip and she is very excited ______ it.

A. for B. against C. about D. with

4. I just took it ______ that he’d always be available.

A. for granted B. into consideration

C. easy D. into account

5. “This library card will give you free access ______ the Internet eight hours a day. ”

A. on B. to C. from D. in

Exercise 1: Choose the best option to complete each of the following sentences.

1. All the food in the refrigerator _______ eaten, and it is empty now.

A. are B. is C. have been D. has been

2. The Vietnamese people ____________ a heroic people.

A. is B. are C. was D. were

3. That the committee members cannot agree with each other about solving that crisis ___________ caused a serious problem.

A. is B. was C. has D. have

4. "Who has been planning tee dance?” “Everyone in the class ____________”

A. is B. has C. are D. have

5. The elderly in my country ___________by their children and grandchildren.

A. is cared for B. care for C. cares for D. are cared for

6. The actor and the circus performer ___________ to the party tonight.

A. is going B. are going c. goes D. go

7. The grey and blue blanket __________ yesterday.

A. was washed B. was washing c. were washed D. were washing

8. Two hours’ study _________ enough for him to prepare a quiz.

A. is B. are c. has D. have

9. I no less than he ________ blissful to see her.

A. are B. is c. am D. be

10. It ___________ these questions that ___________ difficult.

A. are - are B. is-are c. are - is D. is – is 1

1. Mumps __________ usually caught by children.

A. are B. was c. is D. were

12. Seven twelfths of the men __________ another language.

A. speak B. speaks C. is spoken D. are spoken

13. Two kilos _________ pretty small for a newborn baby.

A. makes B. make c. are D. is

14. A basket of apples, oranges, and bananas _________ sent to my husband by his grandparents last Christmas.

A. has been B. have been c. was D. were

15. The Dean and Lexicology lecturer _______ in the lecture theatre then. A. were B. was c. have been D. has been

Giúp mk với!!!!! Thảo Anh Lizzy-Marie

Exercise II: Find the mistake and correct it:

1. The exam papers won’t mark next week because the teachers will be away for a few days.

2. We are not let to cycle in the park, are we?

Khi giải nhớ kèm theo lời giải thích nữa ạ :)))