Complete the sentences.Use the present perfect-positive and negative forms.​

Варианты которые можно вставить в, под каждым предложением.
1)How nice! Tomorrow is Sunday and we ...dont have to  go to school.
a) mustn't b) don't have to
2)You must  get a good night's sleep before the test.
a) must b) have to
3) I have to  go to shop. My mum asked me to buy some milk.
a) Have to b) don't have to
4) I dont have to  do any homework, I can go to the cinema now.
a) mustn't b) don't have to
5)Pupils mustnt  leave their bicycles near this door. It is a rule.
a) mustn't b) don't have to
6) My answer is not correct. I...have to redo my homework .
a) have to b) don't have to

In December 1915 , Lake Morena was nearly empty and everybody in San Diego was praying for rain. In desperation , the city council contacted Charles Hatfield , the Rainmaker. Hatfield agreed to fill the lake for $10 ,000. On January 1 1916 , he started work , using his secret rain-making chemicals. By January 5 , the rain had started. By January 20 , it had been raining non-stop for two weeks. On January 26 , the level of the lake was rising by two feet per hour when suddenly it stopped一just five inches from the top. Having kept his promise , Hatfield wanted his money. But the city council refused to pay , saying that the rain was an ‘ act of God'. Hatfield had only made a verbal agreement , and hadn't signed a contract. He never received a penny.