Tom and Jim are talking. We should tell them _______ noise while watching birds.
A. don’t make B. not make
C. not making D. not to make
---_______ do people cut down so many trees here?
--- To get enough space for a new road.
A. Why B. How C. When D. What
--- Red-crowned cranes need more people’s help.
---Yes. People working in the reserves are doing everything they can ____these birds.
A. save B. saving
C. to save D. to saving
---I often hear a new-born baby next door __________ a lot at night.
---Maybe the baby is hungry then.
A. to cry B. cry C. to laugh D. laugh
About seventy percent of our earth _______ by water.
A. is covering B. is covered
C. are covered D. are covering
Today the forests are getting fewer and fewer. We must______ down too many trees.
A. keep people from cutting
B. prevent people from cutting
C. stop people cutting
D. all the above
