[完成句子]As the sunflowers grow， put a hay fence around them for protection and stake if necessary. Plant morning glories or sweet peas around the base of each sunflower， and they will grow up the stems， eventually forming a roof over the top. By summer‘s end， kids will have a sunflower house to play in.
When autumn comes， children can__________.
A、seed lots of sunflowers
B、play games in the sunflower house
C、include plants with animal names
D、find their own playing section
答案解析：段落最后一句是答案的出处，By summer’s end“夏天结束的时候”实际上就是When autumn comes“秋天来临的时候”。答案选择B。
[填句补文]Doctors believe that secondhand smoke may cause lung cancer in people who do not smoke because nonsmokers often breathe in the smoke from other people‘s cigarettes.________. The US Environmental Protection Agency reports that about 53，000 people die in the United States each year as a result of exposure to secondhand smoke.
A、The risk is even higher for children who live in homes where both parents smoke.
B、In the United States，nine million children under the age of five live in homes with at least one smoker.
C、This smoke is called secondhand smoke.
D、No one knows for sure why Mr. Gilson has lung cancer.