Ⅰ、Choose the best answer.(选择最恰当的答案，用A、B、C或D表示填入括号内) （共20分）
( ) 1. We must plant as many trees as possible ______ make our city cleaner.
A. for B. so that C. to D. because
( ) 2. The TV is too noisy. Please tell him______ .
A. not to forget to turn it up
B. not to forget to turn it down
C. to not forget to turn off it
D. to not forget turned it on
( ) 3.How long have you _______ this furniture？
A. lent B .borrowed C．had D．bought
