We must do what we can to ____________the river _____________

We must do what we can to ____________the river ______________.

#68880

protect; against polluting

stop; polluting

keep; being polluted

prevent; from being polluted

推荐题目

Many difficulties have ______ as a result of the changeover to a new type of fuel.

#65071

risen

arisen

raised

arose

We are going to ________ a dinner party on New Year’s Eve.

#74848

have

play

join

A better plan was _____ by the headmaster.

#72102

put out

put away

put forward

put on

____,the student insists that he be separated from his desk-mate,who is naughty.

#68178

To avoid being affected

To avoid to be affected

Avoiding being affected

Avoiding to be affected

 The UN is trying to ______ the world ________ hunger.

#64798

rid; of

get rid of; by

be rid of ;by

get rid; of

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