—Will you get there by _________ taxi? —No, we’ll take _________ bus.
---Where do Tom and John sit ? --- Tom sits __________ of the room and John sits _________ of the room.
---Is Lucy ______ her homework? --- No , she ________ .
--- Shenzhen is a beautiful city. --- Yes. You can see a lot of flowers and trees on ________ of the streets .
-- What can trees do _________ us ? --- They can _________ harmful gases and produce oxygen .
--- Next week , we will go to visit your school . --- You are welcome _________ our school and you can go _________ to have a look .