We came to Nanjing three years ago, so we ________ here for three years.

night the floor was wet with beer.One young technician slipped and bumped into another. They struggled, ________trying to get the other in a head-lock.

Hi, DaveThis is Helen speaking!—Hi, what a coincidence! I _____ about you

Helping others is a habit, _____ you can learn even atan early age.

People are often at a loss when frequently seeing smog level predictions ________ each other in different official forecasts.