X-rays are able to pass through objects and thus make ______ details that are otherwise impossible to observe.
A. it visible
B. them visible
C. visible
D. they are visible
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______, she failed again in the test and felt very depressed.
As she worked hard
B. Hard as she worked
C. Since she worked hard
D. Hard since she worked
What kind of kites can fly better and higher？
A. The kites whose wings can be taken apart.
B. The kites whose wings can not be taken apart.
C. The kites with large wings that can fly like birds.
D. The kites that have large sizes and peculiar structures.
What is implied in the last paragraph？
A. Diet books are not always helpful.
B. Diet books are usually helpful.
C. There are lots of ways of losing weight.
D. Bookstores are keeping their promises.
There is no point ______ to remember all those names and addresses. The most important thing is to understand the events associated with them.
A. to try
B. to be trying
C. trying
D. be trying
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