Hair colour is ______characteristics to use in identifying people.
A.one of the most obvious that are
B.obviously one of the most
C.one of the most obvious
D.most obvious one of

The chairman requested that______
A.the members study the problem carefully
B.with more carefulness the problem could be studied
C.the problem was more carefully studied
D.the members studied more carefully the problem

Hubble’s law states that the greater the distance between any two galaxies, _______ is their relative speed of separation.
A.the greatest
B.the greater
C.greater than
D.as great as

_____I get your call. I’ll leave.
A.By the time
B.As soon as
C.Now that
D.Although

The onion is characterized by an edible bulb composed of leaves rich in sugar and a pungent oil,______ the vegetable’s strong taste.
A.which the source of
B.that the source is
C.the source of
D.of the source is

Some snakes lay eggs, but others______ birth to live offspring.
A.give
B.giving
C.they give
D.to have given

You______ out yesterday without a coat. No wonder you caught a cold.
A.hadn’t gone
B.didn’t go
C.shouldn't have gone
D.mustn’t have gone

Professor Alan insisted that every student_______ their report by Friday.
A.finish
B.finishes
C.finished
D.had finished

A.potentially
B.fashionable
C.invaluable
D.electrify

A.discard
B.reveal
C.product
D.suppose