The research is so designed that once _____ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
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 |
Our neighbor has ______ ours.
| A．as a big house | B．as big a house as |
| C．the same big house | D．a house the same big as |