Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

If Martin were here now, he _______ us to solve this difficult problem.

A. would help

B. will help

C. has helped

D. helps

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. 

If she ______ sick, she would have gone out with me to the party. 

A. hasn’t been

B. wasn’t

C. weren’t

D. hadn’t been

Ai đúng ? Khi thảo luận nhóm, bạn Sơn nói:

“0,9xy2 và 0,9x2y là hai đơn thức đồng dạng” Bạn Phúc nói: “Hai đơn thức trên không đồng dạng”. Ý kiến của em ?