[填空题]

A. over
B. open
C. often
D. only

[填空题]

A．over
B．open
C．often
D．only

[简答题]People have cooked over open fires and dirty stoves for all of human history, but the simple fact is they are slowly killing millions of people and polluting the environment. Engineers and development professionals have worked on this problem for decades. My own involvement stretches back many years, and I’m well aware that well-meaning efforts have been launched, but none have managed to match the scope of the challenge.

[单项选择]A. No, it’s open only to teachers and postgraduates.
B. Yes, but he needs the approval of his professor.
C. Yes, because he is a senior student.
D. Yes, he can study there if he is writing a research paper.

[填空题]Kids who often struggle over words and have trouble understanding text enjoy themselves in the process.

[单项选择]（　）divorce is often the only satisfactory solution for married couples who can no longer stand the sight of each other, it can have a shocking effect on their kids.
A. Since
B. While
C. As
D. Unless

[填空题]NGO community is often the only available source of support for the internally displaced though the assistance is inadequate for ______.

[填空题]Once open only to the rich, who could{{U}} (36) {{/U}}the fees of expensive country club, tennis is becoming more and more{{U}} (37) {{/U}}. Tennis courts are{{U}} (38) {{/U}}up everywhere. There are indoor and outdoor courts, and even courts on the {{U}} (39) {{/U}}of skyscrapers. Sporting goods {{U}} (40) {{/U}}are doing a booing business in tennis equipment. Tennis {{U}} (41) {{/U}}has become an important item in the{{U}} (42) {{/U}}world. Early in its{{U}} (43) {{/U}}tennis was the sport of king and,{{U}} (44) {{/U}}. The French King Charles V loved to play tennis, but he was very fat and must have been a comical sight on Ire tennis court.{{U}} (45) {{/U}}. In England, Henry IV outlawed tennis because the church leaders of his time were angry that women wore less clothing when they played.{{U}} (46) {{/U}}.