If nothing_(do),the oceans will turn into fish deserts 该用什么时态填空?

If nothing_(do),the oceans will turn into fish deserts 该用什么时态填空? Do you mind if i open the What do you do if you have the flu? if i can do anything,the number i will do What do you do if you have the fly?是什么意思? 英语九年级词组have nothing..你们的问题与今天的作业无关：Your questions have nothing_ _ _ todays homework.三个词,xie xie是应该填to do with吗？突然想到... What do you do if the confirmed delivery date is miss?How do you measure it? How do you feel if you have the flu? What do you if you have the flu? Do you know if the man is badly ill 翻译 if you have the Swine Flu,what should you do What will you do if you get the job?翻译 If you do,the teachers will take it away don't play on the street.if you do,() If I do not know how good that the翻译 do you mind if i open the door还是opening .If we had the chance to do it all again If we had the chance to do it all again