Put the verbs in brackets into the correct tense.
1 As Michelle was getting off (get off) the bus yesterday, she……. (lose) her balance and (fall) to the ground.
2 Christine……… (act) quite aggressively these last few days; I wonder what’s wrong with her.
3 George went to the shop to return the jacket he……. (buy) two days earlier.
4 Melissa always……… (start) her day with a healthy breakfast before she leaves for school.
5 It is estimated that hundreds of plant and animal species………(become) extinct by the end of this century.