________ entered the classroom _________ the bell rang.
The Day of the Dead, an ancient Mexican festival, is not a sad day, but _________time to celebrate__________cycle of life.
How_________I help them to understand when they won’t listen to me?
In summer, food will go bad if_________in room temperature.
QQ,______you can chat with your friends, makes communication easy.
Someone________his car in front of my house and it is blocking my driveway.