Last year, one of the plants exploded violently (violent), and the local people got into a great panic.

　　2．There were many fish floating (float) in the river because of the serious pollution.

　　3．He contrasted the two different economic systems (system) in his speech.

　　4．Many people are aware of the harmful (harm) effects of smoking.

　　5．Everyone was a bit puzzled (puzzle) by her sudden departure.

　　6．Sudan came into existence (exist) at the end of the 1800s.

　　7．She tapped him gently (gentle) on the shoulder.

　　8．The present (presence) situation cannot be allowed to continue.

　　Ⅱ.选词填空

　　on

　　1．There exist many plants along the river.

　　2．Some of them have done_great_harm_to the environment.

　　3．Hearing that some measures had been taken in time to prevent the pollution from getting bad to worse, they all cheered up.

　　4．There is a_chance that these plants will be moved next year.

　　5．Now_that everyone agrees to the plan, let's start for Shanghai next weekend.

　　6．The new bridge is three_times_the_width_of that one built last year.

　　7．We feel_it_our_duty to make our country a better place.

　　8．When the war broke_out,_the two countries broke off their diplomatic relations.

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