5.Dozens of scientific groups all over the

5.Dozens of scientific groups all over the
world have been _____ the goal of a practical and economic way to use sunlight
to split water molecules.
A)
pursuing B) chasing C) reaching D)
winning
13.Nowadays,many services are making
arbitrary charges of _____.
A) fees B)
fares C)
taxes D) duties
9.Today’s weather is an improvement _____
yesterday’s.
A)
to B)
for C) in
D) on
10.The company gradually lost its market
because of _____ management.
A)
bad B) evil C)
ill D) wicked
11.“I’ll give you an example to _____ my
point,” said the speaker.
A) illustrate B) reveal C)
expose D) display