Помогите выбрать верный ответ 1. If she ... me i will

Помогите избрать верный ответ 1. If she ... me i will help her.
a) ask b) will ask c) asks d) has asked

2. Join us! We are sure to have ... lovely time.
a) a b) an c) the d) ---

3. Our services are ... you needn't pay.
a) freely b) free c) more free d) most free

4. According to the rules of the library you ... keep the books for a fortnight.
a) may b) must c) needn't d) need

5. Pensioners didn't have to pay so must for their houses, ... they?
a) did b) didn't c) have d) haven't