Virus Security Software is designed to detect, eliminate or quarantine computer viruses before they are able to harm a computer or server networked system.

_____ they are fit I see no reason why they shouldn’t go on playing for another four or five years.

Each year in the United States, many black teenagers（）of school, either because they cannot keep up or they have to work to support their family.

What they are（）about is which comes first: the chicken or the egg?

Investors are attracted to Internet companies because they

Do you agree or disagree with the following statement? People are never satisfied with what they have; they always want something more or something different. Write a composition of about 400 words to state your view on the issue.

（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion; they may also exert influence over the project and its results.

The goal, which they are unlikely to live to see , is tocure, prevent or manage all diseasesin the next 80or so years.

Why do students like the self-protection lesson?①Because there are no tests.②Because the lessons are boring.③Because they can learn how to save lives.④Because they can know how to stop danger before it happens.

are individuals and organizations that are actively involved in the project, or whose interests may be affected as aresult of project execution or project completion, they may also exert influence over the project and its results.

Doctors are often caught in a _____ because they have to decide whether they should tell their patients the truth or not.

In the USA children start school when they are five years old． In some states they must stay in school (11) they are sixteen． Most students are seventeen or eighteen years old when they (12) school． There are two kinds of schools in the United States: public schools and pri-cate(私立)schools．(13)children go to public schools． Their parents do not have to(14)their education because the schools (15) money from the government． If a child goes to a private school，his parents have to get enough money for his schooling ． Some parents still (16) private schools，though they are much more expensive．Today about half of the high school students(17) unwersities after they finish the secondary school． A student at a state university does not have to pay very much if his parents (18 in that state． But many students(19) while they are studying at universities．In this way they (20)good working habits and live by their own hands．( )11．