We use __to talk about a thing or action without saying what it is .i need __​

ther is a zoo in our town. it is big. there are a lot of animals in the zoo. the are wolves,foxes, elephants, zebras, bears an some others. on sundays parents with their children go to the zoo. children like watching animals' life and feeding them.

to be afraid ,to be hungry,to be busy,to be tired,to be cheerful,to quiet,to be kind,to be lucky

  to   go for a walk,to sit ,to stand,to read,to run ,to jump,to see , to drink,to write ,to think,