With the fast development of computer and Internet technologies, traditional printed books ______ by the growing popularity of online reading of e-books.
| A．are challenged | B．have challenged |
| C．are being challenged | D．have been challenged |
An increasing number of countries have been ________ China as a threatening power recently.
| A．looking up | B．looking at | C．looking on | D．looking for |
All the citizens here strongly insist those found ________ “harmful” advertisement in the streets ________ punished strictly.
| A．putting up; will | B．to put up; should be |
| C．being put up | D．putting up; be |
Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.
| A．of; at | B．on; at | C．by; in | D．of; on |
--May I speak to your manager at four o’clock this afternoon?
--I’m sorry. He ________ to a conference long before then.
| A．will have gone | B．had gone | C．would go | D．has gone |
--Do you need any help, Lucy?
--Yes. The job is ________ I could do myself.
| A．not more than | B．less than | C．more than | D．no more than |