Tìm số tự nhiên x nhỏ nhất biết x chia 3 dư­ 1, chia cho 5 d­ư 3, chia cho 7 dư­ 5

We ________ for this opportunity for more than three years.

A. were waiting

B. have been waiting

C. waited

D. are waiting

Tìm các số tự nhiên x sao cho:

a) x  ∈ B (5) và 20 ≤  x ≤  36

b) x ∈ Ư (12) và 2 ≤  x ≤ 8

c) x ⋮ 5 và 13 < x ≤  78

d) 12 ⋮ x và x > 4

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.

A. sparing 

B. generation 

C. increase 

D. reformation

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

We spent the entire day looking for a new apartment.

A. all long day 

B. the long day 

C. day after day 

D. all day long

- “ _______ .”

- “Never mind, better luck next time.”

A. I’ve broken your precious vase 

B. I have a lot on my mind

C. I couldn’t keep my mind on work

D. I didn’t get the vacant position

“Your parents must be proud of your result at school.” – “_________”

A. Sorry to hear that

B. Thanks. It’s certainly encouraging

C. Of course

D. I am glad you like it

Cho các số: 12; 17; 22; 28; 35; 51; 63; 120; 357; 528. Chỉ ra những số thuộc tập hợp sau:

a) B (4);      

b) B (7).