____seems very hard to reach the top of the mountains.
| A．That | B．This | C．I | D．It |
--- I have a fever.
--- _______. You’d better go to see a doctor.
| A．I’m sorry to hear that. | B．Oh, fine. |
| C．It’s all right. | D．You are bad. |
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 |