_________ the animals _________ our duty.
A. To protect; are B. Protecting; are
C. To protect; is D. To protecting; is
We are making a plan _________ water clean.
A. make B. to make C. making D. makes
Let’s _________ what we can do to save the animals in danger.
A. look after B. look for
C. find out D. look at
--- How can you _________ there? --- ___________air.
A. get to; by B. reach; by
C. get; in D. arrive; on
One of the most famous places of interest in China _________ the Palace Museum.
A. be B. is C. am D. are
---__________ does it take to finish your homework? --- For an hour.
A. How many B. How much
C. How long D. How soon
