用if, unless, as long as选词填空
—Do you like sports?
—Yes, I do some running in the park every day ____ the weather is terrible.

Something        if they have the party tomorrow.

If there        no buying and selling of animals, there         no killing in nature.

—Lucy, what about going camping if it        tomorrow?
—Sounds great!

If we        take environmental problems seriously, the earth         worse and worse.

I don’t know if it        tomorrow. If it       tomorrow, I won’t go to play basketball.

—Shall we go for a picnic in the forest park tomorrow?
—Yes,         it rains heavily.

Nothing in the world is difficult        you put your heart into it.

       you don’t give up, your dreams will come true.

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