This kind of computer is very expensive.It()more than 7,000y

This kind of computer is very expensive.It()more than 7,000yuan.
A.costsB.paysC.spendsD.takes
Our thacher told us()too much time surfing the Internet.It's bad for our health.
A.smokeB.smokesC.somkingD.to smoke
Now lte me tell you waht ()while you were away.
A.happenedB.happeneingC.being happenedD.was happened