The man looks familiar; I remember _____ him somewhere before.

A: We got lost on our way back to the hotel.

B: Why didn't you stop _____ directions?

Cigarettes will do harm to your health. You'd better quit ______.

I finished my English assignment, and then went on _____ math.

Mrs. Smith enjoys sitting on her porch and watching people _____ their shopping at the grocery store.

I'm sorry, but I forgot _____ the candy you wanted.

When it comes to _____ how the body and the mind work, we are really not well-informed.

Running two hundred meters ______ the basic warm-up exercise in our PE class.

Riding bicycles _____ now come into fashion because many people want to protect the earth as well as live a healthy life.

The investment expert suggests ____ all your eggs in one basket.

I don't think they will risk _____ the mountain during a typhoon.  

As for students who have trouble  _____ up with their classmates, Chuck has tried every possible way to increase their confidence.

I can't imagine _____ without the Internet. How inconvenient it would be!

It has been a while since we met last May. I _____ hearing from you.

I remember ____ you I used to have two part-time jobs when I was in college just to make ends meet. (95學測)

We are completely _____ to helping dogs enjoy a full and active life. (96學測)

To have a full discussion of the issue, the committee ____ a whole hour exchanging their ideas at the meeting. (98學測)

Most people probably don't feel sympathy for these endangered creatures, but they do need _____. (99學測)

The ancient Egyptians learned how to preserve the body by dying it out, oiling and then _____ the body in linen, before placing it n the coffin. (100學測)

The American Dental Association (ADA) recommends _____ a new toothbrush every three to four months. (103指考)