2. This river has changed its course many times . It _________ always located where it _________ at present.

　A. isn’t; is　　 　B. isn’t; will be　　 　　C. wasn’t; is　　 　D. wasn’t; has been

1.Some teachers are clever, but not very good at ___________ their ideas to students.

　 A. getting across　　　 B. getting over　 　　　C. getting down 　　D. getting into

80. The result was beyond my _________________(expect).

Expectation

79. Is there any ________________(explain) for his strange behavior?

explanation

78. They spoke very _____________(high) of him.

highly

77. We tried all sorts of medicine but they were all ______________(use).

useless

76. I'm not certain of the __________(true) of his story.

truth

75. You should always be _______________(thank) to your parents for giving you a

good education.

thankful

74. In union there is ___________________(strong).

strength

73. The letter is too long. Can you _____________(short) it a little?

shorten