A.what is his occupation
B.what his occupation is
C.that his occupation is
D.that is his occupation

A.Do you do
B.What will do after school
C.What do you do after school
D.What you do after school

A.How many you have read books / do you understand what you have read
B.How many have books you read / whether you understand have what you read
C.Books you have read / you understand what you have read
D.How many books you have read / whether you understand what you have read

A.Dung dịch nước vôi trong.
B.Dung dịch bari hiđroxit.
C.Dung dịch brom.
D.Dung dịch natri clorua.

A.
B.
C.
D.

A.
B.
C.
D.

A.
B.
C.
D.

A.
B.
C.
D.

A.
B.
C.
D.

A.no, hai chức.
B.no đơn chức.
C.không no, đơn chức.
D.không no, hai chức.