_____ he is very busy, he spends at least two hours every day surfing the Internet in order to find out the latest development in science and technology.

A. Even though                   B. When                       C. Unless               D. Whether

Several weeks had gone by _____ the head of the gallery realized the painting was missing.

A. after                        B. before                      C. since                        D. that

The airline has a booklet _____ will tell you most of the important information to Europe.

A. in which            B. about which              C. /                        D. that

 Students can easily fall behind in their studies ____ they don’t manage their spare time carefully.

A. though                    B. if                             C. since                        D. until

He warmly congratulated them on _____ they had achieved in science and technology.

A. that                          B. where                      C. what                        D. which

_____ of concrete and steel, the Petronas Towers in Kuala Lampu could provide a better chance of surviving than did the World Trade Centre buildings.

A. Building           B. Built              C. To built            D. Having built

Would you consider lying to a good friend to avoid ____ your friend’s feelings？If so, what kinds of things would you lie about?

A. hurting                     B. to hurt                      C. being hurt                D. hurt

It is not until recently ______ the scientists have found proof of there being water on Mars.

A. when                       B. that                          C. how                         D. what

______ our horizons of thinking, but it also saves us time and energy.

A. Not only does the Internet expand                 B. Not only expands the Internet

C. Not only the Internet expands                       D. Not only the Internet does expand

An excellent way to help memory is to connect information with pictures, which ______ as a memory-link method.

A. considers                 B. is considering           C. is considered            D. considered