China’s population is expected to increase to about 1.5 billion in 2040, _____ it will start to decline slowly.
| A．where | B．which | C．after which | D．on which |
I don't think ________ possible to master a foreign language without much memory work.
| A．this | B．that | C．its | D．it |
Child as he was, he ________ a good idea to solve the problem.
| A．came up with | B．came about |
| C．came into | D．came out with |
With the development of science and technology, the prices of TV sets have ________.
| A．gone down | B．went down |
| C．brought down | D．been gone down |
Xu Beihong is most known ________ drawing horses________an artist.
| A．for；as | B．as；for | C．to；for | D．to；as |
The book, ________ for beginners，is popular with students.
| A．designs | B．designing | C．designed | D．to design |