1 . Human impact on the animal kingdom, such as hunting and destruction of habitats, ___________a reduction in the population of certain species in the past three decades.

A．has caused	B．have caused
C．was causing	D．were causing

2 . China is a shining example for the global community to follow _________developing green industry to fight climate change.

A．in addition to	B．in return for
C．in terms of	D．in agreement with

3 . On April 22 every year, people around the world mark Earth Day by _________ the environment.

A．adapting to

B．benefiting from

C．caring for

D．relying on

4 . —Is it all right if I leave a bit earlier?
——_________ . I can finish the report on my own.

A．Sure thing	B．Help yourself
C．Forget it	D．That depends

5 . — Mike will announce his retirement from professional soccer next week.
—________! He’s only 25 and still very fit.

A．I don’t mind at all	B．I couldn’t agree more
C．You will make it	D．You can’t be serious

6 . Guide books are prepared to suit the convenience of the traveler, ________ routes round a city or a site are often suggested.

A．for which	B．with which
C．for whom	D．with whom

7 . If we continue to________ environmental problems, we will regret it sooner or later.

A．highlight

B．identify

C．ignore

D．prevent

8 . ________ his restless students occupied with an indoor sport on rainy days, James Naismith created basketball.

A．To be kept

B．Kept

C．To keep

D．Keeping

9 . Critical reasoning, together with problem-solving, ________ teenagers to make better decisions.

A．prepare	B．prepares
C．is preparing	D．are preparing

10 . ________ gardening may be hard physical work, those who love it find it very relaxing mentally.

A．Although

B．Once

C．Since

D．Unless