Nobody knows how he was murdered, but _______ people behind the scenes can guess why.
| A．a great deal of | B．a good many | C．a good amount of | D．a great many of |
Our teacher insisted that the key words worth paying attention _______ before class.
| A．be underlined | B．being underlined |
| C．to be underlined | D．to being underlined |
With some technical problems to be solved, it may be a while _______ the system is put into use.
| A．when | B．after | C．since | D．before |
That is the only way we can imagine _______ the overuse of water in students’ bathrooms.
| A．reducing | B．to reduce | C．reduced | D．reduce |
A great deal of advanced science and technology has been _______ since China carried out the reform and opening policy.
| A．brought down | B．brought in | C．brought out | D．brought up |
—Have you heard about Apple iPhone 4?
—Sure．It is very hot these days．I’m thinking about getting _______．
| A．one | B．them | C．that | D．it |