单项选择题 The heat in the（）air rising from the kitchen and bathroom is recovered by the pumps.

单项选择题 More （）intelligence companies will start to emerge to meet this challenge.

单项选择题 Thanks to a lot of effort and the support of local people，the business（）.

单项选择题 He said he only wanted one（）of milk –but it was a big one!

单项选择题 Students apply for（）to a particular college.