Fill in the blanks with suitable prepositions only where necessary.If no prepopsition is
needad,write an'X' in the blank.
1)I wonder who she's talking___on the phone.
2)The sofa I slept ____last night wasn't very comfortable.
3)Do you know the name of the boywho she went to the cinema____last night?
4)The girl she is sharing the flat_____ is a flight attendant.
5)The pollution index in the district which we live___is often very high.