11) the decision to build a nuclear power station in the suburbs
考点：同上
12) American woman to explore the outer space
考点：由only, last, next，序数词或形容词最高级修饰的名词常用不定式作定语
13) only to drop it on their own feet
考点：不定式作结果状语
14) to meet a high school classmate in the mountain village
考点：不定式作原因状语
15) to have taken up so much of your time
考点：1. 不定式作原因状语;2. 不定式的完成时
16) to be standing in the doorway when he rushed in
考点：不定式的进行式
17) to be treated as a guest
考点：不定式的被动形式
18) go to the campus bookstore to buy used books
考点：不带to的不定式
19) but play bridge the whole day
考点：同上
20) to wipe our feet on the mat before going into the room
考点：当动词see, make, hear等用于被动语态时，不定式要保留to