(    ) 1. — Can I ______ a book on science from you?

— Sorry, I ______ it to somebody else.

A. borrow; lend   B. borrow; have lent    C. lend; borrowed

(    ) 2 .________ I know, he has written five books.

  A. As long as    B. As far as     C. As more as

(    ) 3. It is a good way to save paper _____ we only read books online. 

A. if     B. but       C. that 

(    ) 4. You should remember to _______ the lights when you leave the classroom.

A. turn on         B. turn off      C. turn down