A.Oxi, cacbon đioxit.
B.Axit axetic, natri oxit.
C.Oxi, natri, axit axetic.
D.Natri hiđroxit, axit axetic.

A.5,75.
B.46,0.
C.23,0.
D.13,8.

A.her cake was ready
B.if her cake was ready
C.was her cake ready
D.that was her cake ready

A.Peter failed his exam
B.Peter failed his exam that
C.that Peter failed his exam
D.Peter failed his exam, that

A.How much have experience you got / if can you work here
B.How much have experience you got / if you can work here
C.How much experience you have got / if you can work here
D.How much experience you have got / if can you work here

A.of how your eating is related with your stress level
B.how your eating is related with your stress level
C.of how is your eating related with your stress level
D.is how your eating is related with your stress level

A.what Susan needs
B.Susan needs
C.what does Susan need
D.that Susan needs

A.how are you here
B.what are you here
C.you are here
D.that you are here

A.why did the teacher suddenly leave the classroom.
B.why did the teacher suddenly leave the classroom?
C.why the teacher suddenly left the classroom.
D.why the teacher suddenly left the classroom?

A.I lived where
B.did I live where
C.where did I live
D.where I lived