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

Out _______ from its tiny cage.

A. does the bird fly

B. flew the bird

C. did the bird fly

D. fly the bird

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Terry______ in three movies already. I think he’ll be a star some day.

A. had appeared

B. has appeared

C. is appearing

D. was appearing

Columbus_________America more then 400 years ago.

A. he has gone

B. has discovered 

C. had discovered 

D. discovered

Giải phương trình sau: tanx + tan (x+π/4) = 1

Bob has a bad lung cancer and his doctor has advised him to ________ smoking.

A. turn up 

B. give up

C. take up 

D. put up

Hòa tan hoàn toàn 19,2 gam hỗn hợp X gồm Fe, FeO, Fe₃O₄ và Fe₂O₃ trong 50 ml dung dịch H₂SO₄ 18M (đặc, dư, đun nóng), thu được V lít khí SO₂ (đktc) là sản phẩm khử duy nhất và dung dịch Y. Cho 450 ml dung dịch NaOH 2M vào dung dịch Y, thu được 21,4 gam kết tủa và dung dịch Z. Giá trị của V là

A. 4,48.

B. 5,60.

C. 6,72.

D. 3,36.