The police were seeking more information to find out ______ the rich merchant.
A.who was it that killed | B.who it was that killed |
C.it was who killed | D.who was it killed |
Radium salts,which have been found to ______ in bones,give rise to bone cancer.
A.pile up | B.build up | C.keep up | D.pull up |
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 |