As is often pointed out, knowledge is a two-edged weapon which can be used ________ for good or evil．

I sincerely regret that I have hurt your feelings, but I didn’t do it ______.

The old man was tired and walk more slowly but he home_______.

—How do you find this new movie?—It's ________ interesting than expected.

.Jim went to answer  the phone __________ , Harry  started  to prepare  lunch.