costly
useful
necessary
complicated
A dramatist usually_______ .［A］ clarifies the complicated relationship in his drama［B］ makes the relationship in his drama more complicated［C］ hopes to see his protagonist win an easy victory［D］ likes to present his protagonist as threatening fellows
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It ______ for an emergency generator to require paralleling.A.is not usualB.is usualC.is necessaryD.is not impossible
Why is it necessary to have routine testing of the cooling water?A.To ensure that the proper residuals of treatment chemicals, as specified, are maintained all timeB.To trace leakage in the cooling water systemC.It is not necessaryD.To detect the presence of contaminants in the water that may be injurious to the cooling system
While discharging a tanker，list can be controlled by ______．A.Shoreside personnelB.Using a center tank near the bow，discharging as necessaryC.Using wing tanks near the longitudinal center，discharging as necessaryD.Using the after peak tank，loading as necessary
It was obvious that he was not going home.A: possible B:evident C: necessary D:probable
The description of what happens in learning process is sometimes too（ ）.A.complex to understand B.difficult to be understood C.complicated to understand D.complicated enough to understand
Why do the critics criticize advertisers?__________A.Because advertisers often brag B.Because critics think advertisement is a "waste of money" C.Because customers are encouraged to buy more than necessary D.Because customers pay more
