43. In order to help human beings live longer and healthier, many scientists are working hard __________ they can invent new drugs.

            A. so that       B. as not to                C. in order that not               D. in other to

Answer: A. so that

44. Many bridges in London are covered with wooden roofs _________ it can be protected from rain and snow.

            A. so that not             B. so as to      C. in order that not               D. in other that

Answer: B. so as to

45. Please arrive on time ________ us to be able to start the meeting punctually.

            A. so that not             B. as not to                C. in order for           D. in other that

Answer: C. in order for

46. The laser beam can attack directly and accurately the diseased cells ___________ the healthy neighbors are left unharmed.

            A. so that       B. as not to                C. in order that not               D. in other to

Answer: A. so that

47. My father and  I do morning exercises every day ___________ improve our health.

            A. to not       B. as not to    C. in order that not   D. to

Answer: D. to

48. We learn English ________________ we can communicate with other people.

            A. so that        B. because                C. that                                  D. so that to

Answer: A. so that

49.He studies very hard so that _______________ pass his final exam next month.

            A. not to          B. in order to           C. so as not to                        D. so that to

Answer: B. in order to

50. ___________ waste electricity, we turn out the lights when there is enough light.

            A. so                B. so as not to          C. that                                   D. so that to

Answer: B. so as not to