All the students are working hard now.—_______. Because all of them want to go to goodcolleges.

We were alarmed at the way in which John reacted________the drug.[ ]

The similarities between social networks are striking.—That ________ come as no surprise，because they are all products of the Internet.

Li Lei cannot eat so big a watermelon. You have to cutit_______.

Is it your brother playingfootball outside– It ________ be him. He is helping motherwith dishes now.