--- Where did he leave his car key? --- It was in the lab he made the experiment.
In summer, food will go bad if________in room temperature.
QQ, you can chat with your friends, makes communication easy.
Mike must be angry with me, for he walked me without even saying hello.
_____ you don’t lose heart, I’m sure you can pass the coming examination.
My house is the one with a red roof on the street. It ____ and you can find it easily.