Question 80. A great number of high school students volunteers for projects on environmental pollution each year. A. high school students C. projects B. volunteers D. environmental pollution Question 81. That my sister played the guitar in public places were surprising. A. played B. the C. were D. surprising Question 82. Beneath Puerto-Princesa Subterranean River National Park in the Philippines flow an underground river. A. beneath B. the philippines C. flow D. underground river Question 83. Near the lake stands several trees that were planted by Horizon Middle School students as part of a World Environment Day celebration on June 5, 2010. A. Near the lake B. stands C. were planted D. as Question 84. A new study by American scientists suggest that teamwork may enhance organizational productivity. A. new study C. suggest B. American scientists D. enhance Question 85. Have you had your computer repair? I think it’s totally broken down. A. Have B. repair C. totally D. broken down Question 87. I think a cup of milk could help you sleeping better. A. a cup B. help C. sleeping D. better Question 88. The price of gas is twice expensive as it was a few days ago. A. The price C. it was B. twice expensive as D. days Questions 89. The hospital has asked voluntary organizations to help raising money for the new operating theater. A. has asked B. voluntary C. to help D. raising Question 91. There was a beautiful arrangement of drying flowers on the desk. A. was C. drying B. a beautiful arrangement D. on the desk