If you are in the zoo, remember not to touch or go near the animals. Although some of the animals are cute, you _________ leave them alone. 

--It is really fun to hike and I often go hiking in the forest.--But hiking alone in the forest ______ be very dangerous.

—Why didn’t you come to Simon’s party last night?—I wanted to, but my mom simply _____ not let me out so late at night.

The boy is afraid of darkness, so he _____ out at night.

You ________ come tomorrow. I can do it myself.