Experts believe ______ people can waste less food by shopping only when it is necessary.
| A．why | B．what | C．where | D．that |
I was fortunate to pick up a wallet on the ground on the way home, but unfortunately for me, I found my color TV set when I got home.
| A．lying; stolen | B．laying; stealing |
| C．lay; stolen | D．lying; stealing |
In order to find the missing child, villagers all they can over the past five hours.
| A．did | B．do |
| C．had done | D．have been doing |
The head of the company promised to deal with matters of this sort he returned to his office.
| A．until | B．while |
| C．at the time | D．the moment |
We can never expect bluer sky unless we create less polluted world.
| A．The; the | B．/; the |
| C．A; the | D．a; a |
—rapid progress they have made!
— Right. And it is true the students from other developing countries.
| A．What a; with | B．How a; for |
| C．How; of | D．What; of |