Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
He asked me if there had been any spaceships launched ______.
A.two years ahead
B.two years before
C.two years ago
D.two last years

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The man told his friend that he saw a UFO ______.
A.the next day
B.tomorrow
C.the day before
D.the last day

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
She asked me _______ had been the first person to step on the moon.
A.what
B.if
C.who
D.how

Trong phòng thí nghiệm $ C{ O _ 2 } $ được điều chế bằng cách:
A.nhiệt phân $ Ca{{\left( HC{ O _ 3 } \right)}_ 2 } $
B.nung $ CaC{ O _ 3 } $
C.cho C tác dụng $ { O _ 2 } $
D.cho $ CaC{ O _ 3 } $ tác dụng HCl

Choose the word whose underlined part differs from the other three in pronunciation in the following question.
A.shopping
B.spring
C.school
D.celebrate

Choose the word whose underlined part differs from the other three in pronunciation in the following question.
A.should
B.she
C.wish
D.small

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
He asked me _____ there were people living on Venus.
A.when
B.how
C.where
D.if

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in the following question.
A.second
B.smile
C.shine
D.summer

Hiện tượng quan sát được khi cho dung dịch nước vôi trong vào dung dịch $ Ca{{\left( HC{ O _ 3 } \right)}_ 2 } $ là
A.không có hiện tượng gì.
B.có kết tủa trắng và bọt khí.
C.có kết tủa trắng.
D.có bọt khí thoát ra.

Chất nào sau đây chứa $ CaC{ O _ 3 } $ trong thành phần hoá học ?
A.Cacnalit
B.Đôlômit
C.Pirit
D.Xiđerit