1.   Afterwards he was tested positive in a random check.

2.   They do random checks to keep workers on their toes.

3.   A number of local law societies felt that random checks would be more productive in revealing problems.

4.   To make sure the system is working says stocktaking exercises are carried out on a regular basis and there are random checks of the collections.

5.   More random checks are to be held over the next few weeks.

6.   A random check of area bookstores confirms the trend.

7.   A random check of several local cities indicates that at-home business is still a long way from being a hot button.

8.   A random check on Thursday indicated that some documents were, in fact, posted on the site within three minutes of submission.

a. + check >>共 576
routine 5.90%
medical 5.07%
bad 4.16%
random 2.69%
monthly 2.38%
canceled 2.20%
personal 2.12%
regular 2.08%
first 1.93%
quick 1.82%
random + n. >>共 529
drug 5.69%
access 4.83%
violence 3.69%
test 3.60%
check 3.23%
sample 3.14%
act 2.92%
search 2.23%
number 1.91%
sampling 1.78%
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