----How long has Sam been skating?------He for five hours.A have been skating B has been skating C was skating D has been skated
---How long have you lived in the new flat?---__________ 2010.
---Let’s go fishing if it ________this weekend.---But nobody knows if it ___________.
---Tom has ______ a good way to deal with his old books. He plans to donate them to poor children.---Really? That’s great.
---She’s hardly ever been seen to sing in KARAOKE bars,_______she?---That’s true. She shows little interest in singing.
----What’s wrong with you, Eric? You look tired.----I________ to prepare for the final exam last night.