Mr. Smith bought three of local snacks for the exchange students．（box）
Lots of tourists are amazed at the beauty of the in Yunnan． （蓝天）
Some in the medical research helped control the terrible illness． （ achieve ）
My father stopped smoking． （ final ）
Nick gave his mother a scarf on her birthday． That made her very happy． （ forty ）
﹣Let's go swimming in the river this afternoon．
﹣We'd better not． It's ． （ danger）