Mr. Zhou was really anxious _____he can’t find his car. 

–All the students in your class are in the photo ____ Susan. Why? --Aha, that is because she helped us take this photo.

They will lose the game ______they try their best.

Helen didn’t know anything about it            her father told her.

—Susan, what are the advantages of MP5 players?—Mom, they are smaller and lighter ______ they can be carried very easily.