Cho biết $ y $ tỉ lệ thuận với $ x $ theo hệ số tỉ lệ $ \dfrac{3}{4}. $ Tính giá trị của $ y $ khi $ x=\dfrac{4}{9}. $
A. $ y=\dfrac{27}{16}. $
B. $ y=\dfrac{16}{27}. $
C. $ y=3. $
D. $ y=\dfrac{1}{3}. $

Điền số thích hợp vào ô trống để hoàn thành câu sau về vận chuyển các chất trong thân.
Thân vận chuyển các chất theocon đường chính.
Nước và muối khoáng được vận chuyểnchiều.
A.2
B.1
C.
D.

Chọn đáp án đúng
Mạch gỗ không vận chuyển chất nào sau đây?
Ôxi
Nước
Nitơ
Kẽm
A.answer1
B.
C.
D.

Chọn đáp án đúng
Mạch rây không vận chuyển chất nào sau đây?
Đường
Cácbôníc
Chất dinh dưỡng
Chất hữu cơ
A.answer2
B.
C.
D.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If he_____ to London yesterday, _____ his old friend.
A.went/would meet
B.went / would have met
C.had gone / would have met
D.go/would meet

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_______ that problem with the car, we wouldn't have missed the speech.
 
A.Unless we had had
B.Provided that we had had
C.If we had had
D.If had we had

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If you _________ up with new technology, you _____________ left behind at work.
 
A.didn’t keep/will be
B.don’t keep/ would be
C.don’t keep/ will be
D.kept/ will be

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
She’s out of work again! If she _____ improving her skills through lifelong learning, she _____ new ways to make herself more employable.
A.continued/ would have found
B.continued/ will find
C.had continued/ would have found
D.had continued/ would found

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If you ____ an A as a mark for a piece of work or in an exam, your work ____ extremely good.
 
A.got/ would
B.gets/ be
C.get/ would be
D.get / is

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If he ________how to present his ideas in his previous job, he ______ no trouble becoming a good manager.
A.had known/ would have
B.had known/would have had
C.knew/ would have
D.know/ will have