--Are you a teacher?
--No, but I ________.
| A．used to | B．was used to | C．used to be | D．used to do |
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 |
The plane is flying ____ a speed of 500 kilometers an hour ____ the way to Kunming.
| A．with; on | B．at; on |
| C．at; in | D．with; in |
You can’t learn to play the piano without practising．____, you can’t learn a language well without using it.
| A．Likely | B．Hopefully |
| C．Similarly | D．Personally |
We’ll ____ three groups to carry out the experiment in chemistry．
| A．be separated from | B．be divided into |
| C．be divided from | D．be separated off |