-Would you like to help me clean the lab at 4 o'clock this afternoon?-I would like to, but I __________ listening practice then.
A container weighs more after air is put in,_____proves that air has weight.
I’ll take you to a shopping center nearby_____you may buy all_____you need.
Do you know the reason_____she didn’t attend her boyfriend’s birthday party yesterday?
What especially impressed us was the way_____the girl studied foreign languages.
The young boy got himself into a dangerous situation_____he might lose control over his sports car.