Children under 12 years of age in that country _____ be under adult supervision when is a public library.
| A．must | B．may | C．can | D．need |
The computer, help we human beings have stepped into the information age, should be regarded as one of the most important inventions in the 20th century.
| A．which | B．whose | C．with its | D．with whose |
The little boy, out of curiosity, _______ the toy to see how it worked, but couldn’t put it together.
| A．took apart | B．broken down | C．burst into | D．knocked off |
–Do you need any help, Lucy?
--Yes. The job is I could do myself.
| A．less than | B．more than | C．no more than | D．not more than |
These flowers should not be watered too ______, once _____.
| A．long; every other day | B．often; every fourth day |
| C．soon; every two days | D．frequently; each five days |
It is said that the software on learning subjects for pupils in a very practical way.
| A．designed | B．designing | C．are designed | D．is designed |