More attention must be paid____ the endangered animals.
| A．protect | B．to protect | C．to protecting | D．protecting |
______ and short of breath, Andy and Ruby were the first to reach the top of Mount Tai.
| A．To be tried | B．Tired | C．Tiring | D．Being tired |
My uncle’s house in the downtown area is much smaller than ours , but it is twice _______ expensive .
| A．as | B．so | C．too | D．very |
The questionnaire takes ______ ten to fifteen minutes to complete and can be used along with the assessment interview.
| A．mainly | B．punctually | C．approximately | D．precisely |
As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
| A．primary | B．alternative | C．instant | D．unique |
Ten years ago the population of our village was ______ that of theirs.
| A．as twice large as | B．twice as large as |
| C．twice as much as | D．as twice much as |