Conditional Sentences of the 1st type

If he___( to polute) water, he___(to do harm) to the environment.

If Bob and Bill____(to clean up) after picnics together with their friends, Ann____(to invite) them to the party next Friday.

Kate ____(to meet) you, if you____(to be) here tomorrow.

 They_____(to visit) the London Eye if she____(to come) to London next week.

You_____( to be) healthy if you____(not to eat) junk food.

They ____(to pass) the exam if they_____(to work) hard.

Our streets______ (to be clean) if you_____( not to litter).

I____( not to buy) a souvenir if the shop_____(to be) closed next Wednesday.