41. The report by the secretary yesterday afternoon.
 A. typed
B. was typed
C. being typed
D. has been typed
42. If modern technology did not exist, we such precious information.
 
A. never would have
B. never have
C. never had
D. would never have
43. Although sperm whales in all oceans, they prefer the waters with high squid population.
A. find
B. is find
C. can be found
D. can find
44. The levels of carbon dioxide in the atmosphere have risen _ the burning of fossil fuels.
 
A. therefore
B. despite
C. because
D. due to
45. The polluted water makes the fish _.
 
A. die
B. to die
C. death
D. dying
46. water is one of the factors that have driven many species to the verge of extinction.
 
A. Contaminate
B. Contaminated
C. Contamination
D. Contaminant
47. Many people in this city have received medical for the disease.
 
A. treat
B. treated
C. treatment
D. untreated
48. In many poor nations, there are frequent outbreaks of cholera and other diseases because people there untreated water.
A. to drink
B. drink
C. drinking
D. drank
49. Like the kangaroo and koala, the platypus is a animal in Australia.
 
A. scenic
B. tailless
C. unique
D. foreign
50. David uses English as his mother because he comes from the UK.
 
A. mouth
B. nose
C. cheek
D. tongue
51. “How is your holiday in New Zealand?” ~ “ ”
 
A. Bless you!
B. Absolutely right!
C. Awesome!
D. That’s a relief.