Помогите с английским,раньше учил немецкий

Choose the correct item
1.She always ... the door with a key.
a.has locked
b.locked
c.locks
2.Mary... the floor in the kitchen now
a.is washing
b.washed
c.has washed
3.Jack ... us lately
a.joins
b.joined
c.has joined
4.The pupils... biology last year
a.studied
b.studies
c.has studied
5.They ...never ... at him
a.laughed
b.laughs,
c.have laughted