Ex.3
1.are you going ;am going ;is;
2.are you doing ;am studying ; Do you want ; sound ;
3.are you cooking ; am trying ; smells;
4.am going ; want ; need ; understand
Ex.4
1.on ; at
2.on
3.above
4.beside
5.under
6.in
7.beside
Ex.5
1.In
2.at
3.in
4.In
5.in
6.On
7.at