49. The boss of the company has always attended to the ____of important business himself.
A. transaction B. stimulation C. transition D. solution
50. He ordered the work ____.
A. started at once B. to be started at once C. to start at once D. at once start
51. What seems confusing and fragmented at first might well become____a third time.
A. notable and systematic B. clear and organic C. clean and measurable D. pure and wholesome
52. They failed to pass the exam last time; I regretted ____.
A. to be not able to help B. being unable to helpC. being not able to helping D. not be able to help
53. At a press conference after the Oscar Award ceremony, the 18-year-old girl spoke in a barely____ voice.
A. identical B. legible C. optional D. audible
54. All ____is a continuous supply of fuel oil.
A. what is needed B. that is needed C. the thing needed D. for their needs
55. Today dozens of scientific group in different countries have been____the goal of a practical and economic way to use sunlight to split water molecules.
A. reaching B. winning C. chasing D. pursuing
56. You said the books were on the desk, but ____there.
A. there was no one B. there were none C. there were no ones D. was none