60. If any difficulties ____, you can call me for help.
A. arise B. happen C. occur D. take place
61. Because of the severe international situation, the government has urged people to be ____ with food and water.
A. thrift B. economic C. economical D. economy
62. After 10 hours at the wheel of the car, he began to feel the ____.
A. tension B. nervous C. exertion D. strain
63. Would you please____ a seat for this evening’s concert?
A. reserve B. preserve C. conserve D. save
64.The concept of ____grouping people with similar interests and abilities was very popular among educators.
A. implement B. homogeneous C. integrated D. perfection
65. The introduction of fabrics made from rayon, nylon and other ____fibers has made many changes in our civilization.
A. manufactured B. artificial C. synthetic D. manned