单项选择题

This (equipment) is (based upon) advanced (techniques) and it is (highly reliable).

A. equipment
B. based upon
C. techniques
D. highly reliable
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单项选择题
(Despite) his old (age), he is still (very) (healthful) and often works in the field.
A.Despite
B.age
C. very
D. healthful
单项选择题
The passengers (saw) the thief (stole) (on the bus), but they (didn't say) anything.
A. saw
B. stole
C. on the bus
D. didn't say
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