Each year quite a lot of food________ around the world.
| A．was wasted | B．is wasted |
| C．wasted | D．will be wasted |
--- 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 |
--- Tom is one of _________ students in my class .
--- Yes . He usually prefers _________ at home to playing outside .
| A．the most hard-working , studying | B．more hard-working , to study |
| C．the most hard-working , to study | D．more hard-working , studying |
--- We don’t allow _________ in the library .
--- So we had better _________ outside .
| A．smoking , smoking | B．to smoke , smoking |
| C．to smoke , to smoke | D．smoking , smoke |