Раскройте скобки, употребляя глаголы в Present Simple, Present Continuous, Present Perfect,

Раскройте скобки, употребляя глаголы в Present Simple, Present Continuous, Present Perfect, Past Simple, Past Continuous, либо Future Simple:
1)You (to book) the tickets?-Yes, I...I (to book) them several days ago.
2) Look! Somebody (to climb) a tree.
3) When I (to enter) the kitchen, my mother (to cut) some cabbage.
4) He (to go) to the library twice a week.
5) When you usually (to go) to school?