It is necessary that he ______ out the information for my reference.
A. sorts
B. sorting
C. must sort
D. sort
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It is essential that laws and regulations ______ worked out and enforced toprotect water resources.
A. are
B. be
C. being
D. been
______, due to unforeseen circumstances, this year's show has been cancelled.
A. Unfortunately
B. Undoubted
C. Fortunately
D. Obvious
______, you have mistaken me for somebody else.
A. Unfortunate
B. Fortunately
C. Undoubtedly
D. Obvious
Various setbacks and problems ______ production.
A. devastate
B. delayed
C. postpones
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