_____the climate changes so much has caused many discussions among the scientists.
| A．What | B．Which | C．When | D．That |
Experts say ________ to sunlight for too much time will do harm to one’s skin.
| A．exposed | B．having exposed |
| C．being exposed | D．exposing |
—What about the student in your class, Mr. Wang?
—The doctor said that sleep caused him poor memory and poor concentration.
| A．lacking of | B．lacked in | C．lacking | D．lack for |
Before driving into the city, you are required to get your car ____.
| A．washed | B．wash |
| C．washing | D．to wash |
To avoid on how to use the word, you’d better refer to a dictionary.
| A．to get confused | B．getting confused |
| C．to get confusing | D．getting confusing |
Some insects________the colour of their surroundings to protect themselves.
| A．take in | B．take off |
| C．take on | D．take out |