I ________ my homework while my parents ________TV at 9 last night.

s Tom is, exercise has always been ______ hiswork.

The volunteers for the Shanghai World Expo are busy from dawn ______ dust but they feel very proud of it

We are strongly against the company’sdecision _______ it will fire half of its staff in the following years

There is a big dog _______to a fence outside the house.