Use the right modal verb(must,mustn039;t,have to,to be,should,could,needn039;t)and make the

Use the right modal verb(must,mustn't,have to,to be,should,could,needn't)and make the sentences correct:
1.You...(to help)your granny.She was carrying heavy bags.
2.We missed (не распечаталось).Now we...(to take) a taxi.
3.This mixture...(drink) twice day.
4)Tim...(to send)his letter.His mother had done it herself.
5.George... (to buy) this medicine.It will help him.
6.You sister is preparing for exam.You...(to bother) her now
7.The congressmen...(to visit) the international conference in July.
P.s( вместо точек ещё надобно воткнуть mustn't should и тд )