Needn't
. must can • mustn't
• should (x2) . could
1 You're obliged to drive below the speed limit.
You must drive below the speed limit.
2 Is it OK if we get a taxi?
3 It's against the law to fly without a passport.
4
It's not necessary for you to run for the train.
5
I advise you to leave early for the flight.
6
It's probable Alihan will go on holiday next
year.
.
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...
...
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7
It's a good idea to give your laptop to the
security staff if they ask for it.​

а) to be excited, to work in the garden, to decorate the streets, to celebrate the New Year Day, to exchange presents/gifts, to watch fireworks/salute, to have a good time.
b) to go shopping/to do the shopping, to make tea, to prepare decorations, to make/cook/prepare food, to dust, to call/to phone/to ring up, to wash up/to wash the dishes, to deliver a speech, to make a report, to do homework.
c) We always celebrate Mum's birthday. It's always in September, in autumn.
I decorate the flat. Granny bakes/makes a cake and cooks a special dish. My twin
 brothers are prepare bright holiday decorations. We get nicely dressed , buy  roses for Mum and sing her favourite song.

Yesterday I got up at seven o'clock. I opened the window , made my bed and did my morning exercises. Then I washed my face and dressed. In half an hour I was ready for breakfast. After my breakfast I put on my ha and coat , took my bag and went to school. Classes began at eight. As I live near my school I always walk there. We had six lessons . At 2 o'clock In the afternoon the school was over. I came home , had dinner , washed up and had a short rest. At 5 o'clock I sat down to do my homework. It usually takes three hours to do my homework.
Sometimes I go to the cinema or visit my friends in the evening.
At 8 o'clock I had supper. After supper our family got together in the living room where we talked, read newspapers and books and watched tv . At eleven o'clock I went to bed .