_____ his parents _____ he likes the red car,but they can't afford it.
根据本题语境可知，不仅他父母，而且他也喜欢那辆红色的汽车，故not only…but also符合题意。若选选项A，应将likes改成like。
There is _____ knocking at the door. Go and see who it is.
anybody“任何人”；nobody“没有人”；everybody“每人”；somebody“某人”。由后句句意“去看看是谁”可知前句句意为“有人在敲门”。故选选项D。somebody 多用在肯定句中，而 anybody 常用在否定句或疑问句中。
根据下面的对话情境，在每一个空白处填上一个适当的句子，使对话意思连贯完整。
A: Have you read today's newspaper?
B: Not yet. 1.?
A: Yes. The air pollution is becoming more and more serious. There will be more smog tomorrow.
B: 2.!
A: So it is! We will have to go out with face masks.
B: 3.?
A: According to the news,PM 2.5 pollution is the main problem with air pollution. It is mainly caused by cars and factories.
B: How can we solve the problems?
A: Cars with many emissions should not be allowed to sell. 4..
B: Besides,everyone should try his best to play a part in protecting the environment.
A: 5.