Điền số thích hợp vào chỗ chấm
$ 5900d{{m}^{2}}=....{{m}^{2}} $
A.59.
B.590.
C.5.
D.509.

Điền đáp án đúng vào ô trống
Để lát nền một căn phòng, người ta đã sử dụng hết 200 viên gạch hình vuông có cạnh 40cm. Hỏi căn phòng đó có diện tích bao nhiêu mét vuông, biết diện tích phần mạch vữa không đáng kể?
m$^2$
A.32
B.
C.
D.

Điền số thích hợp vào chỗ chấm
$ 400d{{m}^{2}}=....{{m}^{2}} $
A. $ 40 $ .
B. $ 401 $ .
C. $ 400 $ .
D. $ 4 $ .

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Many people find it too ………. to change their smartphones often.
A.costly
B.dangerous
C.interesting
D.smart

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The wind caused the tent to ……….
A.weaken
B.lower
C.collapse
D.sink

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Some people still believe that modern science can _____ all the world's problems.
A.charge
B.cause
C.transfer
D.solve

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
We’ll save a lot of ………. if we go there by car. It may take only 30 minutes.
A.speed
B.power
C.water
D.time

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
I wish someone would ………. an everlasting light bulb.
A.invent
B.find
C.discover
D.research

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Such a database would be extremely ………. to set up.
A.wisely
B.costly
C.friendly
D.lucky

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Man-made ………. such as polyester are easy to wash and iron.
A.lakes
B.landscapes
C.fabrics
D.chemicals