— Your backpack is very nice.
—____________.
| A．Thank you. | B．Yes, it is. |
| C．That’s right. | D．You’re welcome. |
---Where do Tom and John sit ?
--- Tom sits __________ of the room and John sits _________ of the room.
| A．in front; at back | B．in the front; at the back |
| C．in front; at the back | D．in the front; at back |
---Is Lucy ______ her homework?
--- No , she ________ .
| A．do; doesn’t | B．does; isn’t | C．doing; is | D．doing; isn’t |
--- Shenzhen is a beautiful city.
--- Yes. You can see a lot of flowers and trees on ________ of the streets .
| A．both sides | B．all sides | C．both side | D．all side |
-- What can trees do _________ us ?
--- They can _________ harmful gases and produce oxygen .
| A．helping , take in | B．to help , take in | C．helping , take out | D．to help , take care |
--- Next week , we will go to visit your school .
--- You are welcome _________ our school and you can go _________ to have a look .
| A．visit , somewhere | B．to visit , anywhere | C．to visit , nowhere | D．visiting , anywhere |