1.Find and correct the mistake.
a)These color televisions are too expensive for me to buy at this time
b)I don't know what is the doing at the moment
c)Smoking cigarettes aren't allowed in the hospital
d)The shopkeeper asked the boys don't lean thier bikes against his window
e)Let's stop to work for a while .I'm getting tired
g)Jane hasn't worked for last summer when the factory closed down
h)The armchair is in the living room,among the TV and the sofa
i)The big present is wrapped in red paper in five dollars
k)He has learnt Chinese enough to live in China
l)Mr.Nam used to travel a lot of but now he didn't