A.Was it a week ago that you last saw George?
B.Where do you think George was all last week?
C.Have you got any idea what happened to George last week?
D.Did you, by any chance, see George last week?

A.Jean’s mother said she liked her dress.
B.Jean’s mother complimented her on her lovely new dress.
C.Jean’s mother wanted to buy a lovely new dress.
D.Jean’s mother told her to buy that lovely new dress.

A.The money is thought to be stolen by Steve.
B.Many people think that the money is stolen by Steve.
C.Steve is thought to have stolen they money.
D.It was Steve who stole the money.

A.HCl.
B.NaOH.
C.AlCl3.
D.NaNO3.

A.5,60.
B.7,80.
C.6,72.
D.13,44.

A.2,24.
B.5,60.
C.4,48.
D.3,36.

A.etilen.
B.axetilen.
C.anđehit axetic.
D.axit axetic.

A.Dung dịch lysin không làm đổi màu quỳ tím.
B.Etylamin phản ứng với dung dịch NaOH.
C.Protein đơn giản chứa các gốc β-amino axit.
D.Phân tử Gly-Ala-Val có 4 nguyên tử oxi.

A.64,8.
B.129,6.
C.108,0.
D.151,2.

A.20,3.
B.19,2.
C.26,4.
D.22,8.