----: I get up at five o'clock tomorrow morning?
----: No, you .
| A．Must; can't | B．Must; needn't |
| C．Can't; can | D．Must; shouldn't |
---_______ 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 |