英语单选5道21.The most important thing about cotton in history is

英语单选5道
21.The most important thing about cotton in history is ________ part that it played in _______ Industrial Revolution.
A./; / B.the; / C.the; the D.a; the
22.It hit me ______ my mother could be the proper person to persuade dad to change his mind.
A.which B.what C.that D.if 23.he will return to his homeland,but I don’t know what country he is studying in.
x05A.It is long before thatx05x05 B.It is before long thatx05x05x05
C.It won’t be long beforex05x05D.It will be before long that
32.According to our agreement,all payments be made by the end of this month.
x05A.willx05x05 B.shallx05x05 C.mayx05x05 D.can
35.He found his son by letters and papers and very worried.
x05A.surrounding; lookx05x05x05B.surrounded; looked
x05C.surrounding; lookingx05x05x05D.surrounded; looking