________ many times, he finally understood it．
If you go by ______train ,you can have quite a comfortable journey ,but make sure you get _____fast one.
______recent report stated that the number of Spanish speakers in the U.S .would be higher than the number of English speaker by_____ year 2090.
The house built of stone lasts longer than ____ built of wood.
Jane tried to keep up a calm appearance，but her trembling voice ______.
It is a great______for a person to be able to drive when he is seeking a job.
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