According to the arrangement，the athletes of our school________at the gym for two hours every day

Julie，what ______in your handLook! It’s a new iPad for my daughter．

They didn’t go to bed ________ they finished their homework.

_______ people in the world are sending information bye-mail every day

the start of the Industrial Revolution, mankindwas poor, hungry, and constantly at the _______ of disease and naturaldisasters