Air pollution can ________ humans by causing sore eyes and respiratory problems, especially in children and the elderly．

A．effect

B．offer

C．affect

D．effort

Many schools in Wenchuan ________ completely by the earthquake on May 12, 2008．

A．has been destroyed

B．have destroyed

C．were destroyed

D．have been destroyed

It is reported ________ drink cans are ________ away in Britain each year．

A．seven billions; throwing

B．seven billion; thrown

C．billions of; throwing

D．seven billion of; thrown

Let sunshine in while ________ much of the warmth from ________ out．

A．keeping; getting

B．to keep; getting

C．keep to get

D．keeping; to get

Plastics are often used to make ________ coverings for many products．

A．protect

B．protective

C．protection

D．protector

Scientists say that there are hardly ________ things on the moon．

A．lifeless

B．alive

C．living

D．lively

It is vital ________ our life that we must ________ our environment．

A．to; protect

B．to; harm

C．for; protect

D．for; provide

Many people are still in ________ after the earthquake and doctors and nurses are watching them very carefully．

A．dangerous

B．threatened

C．threats

D．danger

They are all ________ the coming Christmas party．

A．getting ready to

B．getting ready at

C．preparing for

D．prepare to

I would like tea ________ milk and sugar．

A．and

B．in

C．with

D．the