As an engineer， you can't be careful． You should pay attention to every detail．（ ）
A．veryB．tooC．soD．quite
The Yangtze River is one of ________ rivers in the world.
| A． |
long |
B． |
longer |
C． |
longest |
D． |
the longest |
His guitar ________ as a gift for him last week.
| A． |
buys |
B． |
is bought |
C． |
bought |
D． |
was bought |
_________ a fresh spring morning it is!
| A． |
Who |
B． |
Why |
C． |
What |
D． |
How |
Mr. Brown told his son not ________ the paintings in the museum.
| A． |
touch |
B． |
to touch |
C． |
touching |
D． |
touched |
They have been friends ________ they first met.
| A． |
since |
B． |
while |
C． |
before |
D． |
after |