The rivers will become dirtier and dirtier ______ we take action to protect them.

The rivers will become dirtier and dirtier ______ we take action to protect them.

#56392

since

until

unless

推荐题目

Jack usually goes to school by bike, ________ today he walked to school.

#56403

and

but

Tom is a true friend, _____ I didn’t like him at the _____.

#58189

but; beginning

or; end

and; end

and; beginning

I like going to the movies with friends and__sports.

#57361

play

playing

to play

played

Stop smoking, _______ you will get better soon.

#58498

and

but

after

---What did you do last night? ---I didn’t play the piano, _______, I watched a film with my parents.

#57907

but

and

instead of

instead

共1556题