Поставьте предложения в active voice. 1. my pen was taken by somebody. 2. who has been invited to dinner by tom? 3. a new rule is being learned by them at the moment 4. their steps were heard by us. 5. our cafe is visited by a lot of people.

1 Somebody took my pen
2 Whom has Tom invited to dinner? 
3 They are learning a new rule at the moment
4 We heard their steps 
5 A lot of people visit our cafe