[单项选择]Why are you always late, Mark Can't you ever arrive ______ time
A. on
B. in
C. at
D. by

[单项选择]Why are you always late, Mark Can't you ever arrive ______ time
A. on
B. in
C. at
D. by

[单项选择]You never told us why you were late for the last meeting, （　）
A. weren't you
B. didn't you
C. had you
D. did you

[单项选择]You never told us why you were late for the party, ______

[单项选择]

Have you ever wondered why different animals or pests have their particular colors Colors in them seem to be used mainly to protect themselves.
Birds, especially seagulls, are very fond of locusts, but birds cannot easily catch locusts because locusts change their colors together with the change of the color of crops. When crops are green, locusts look green. But when crops are ripe, locusts take on exactly the same brown color as crops have. Some other pests with different colors from plants are usually easily found and eaten by their enemies. So they have to hide themselves in terror for lives and appear only at night.
If you study the animal life in any part of the world, you will find the main use of coloring is to protect themselves. Bears, wolves and other beasts move quietly through forests. They are usually invisible to the eyes of hunters, because they have the color much like the barks of trees.
An even more strange act remains to be noticed. A
A. the change of color in locusts
B. the protective coloration of animals and pests
C. how a certain sea fish protects itself
D. animals or pests can dye themselves different colors

[单项选择]"Please （　） why you're so late", said his girlfriend.
A. excuse
B. explain
C. apologize
D. tell

[单项选择]"Please ______ why you're so late", said his girlfriend.
A. excuse
B. explain
C. apologize
D. tell

[单项选择]I can't understand why you regard it as music. It ______ me mad!


A. puts
B. sets
C. drives
D. changes

[单项选择]Why are you so late I ______ for you all the time.
A. have been waiting
B. am waiting
C. have waited
D. will wait

[单项选择]Why can't you stop your eternal complaining
A. everlasting
B. long
C. temporary
D. boring

[单项选择]How can I ever concentrate if you are continually ________ me with silly questions


A. intimating
B. interfering
C. interrupting
D. invading

[单项选择]Why are you so late I _________for you all the time.
A. have been waiting
B. am waiting
C. have waited
D. will wait

[单项选择]Why can the police help you to find out directions within a neighborhood


A. They can fax you a map of the neighborhood.
B. They often visit each house in the neighborhood.
C. They know the name of each street in the neighborhood.
D. They have a map of all the buildings in the neighborhood.