1. Sue can't have/must have been at the party last night. She's on holiday in Italy right now. 2. Karen may/has to leave school early tomorrow. She has a dentist appointment after school. 3. If Mary gets permission from her parents, she may/must study in France next year. 4. Students mustn't/needn't run in the school corridors. It's against the rules.

1) they aren’t reading
2) i’m cooking tonight
3) Is he seeing the doctor tomorrow?
4) are you eating chocolate?
5) what are you doing?
6) are we making a mistake?
7) you are coming tomorrow
8) it’s snow
9) John is sleeping at the moment
10) he aren’t dancing
11) how are they getting here?
12) when is it starting?
13) i’m not speaking Chinese at the moment
14) Is Jill drinking tea now?
15) is he paying the bill at the moment?
16) i’m staying with a friend for the weekend
17) when is John arriving?
18) are they coming to the party?
19) we aren’t studying
20) am i being silly?

№1
1'cause he fooled Fat
2 to grocer's
3Mrs Pie
4 he saw a bun in Fat's hand
5 Yeah
№2
a)any rolls and buns
b) to the grocer's
c)opened his mouth
d)cookes them
e)cook tasty buns
№3
a2
b2
c3
№4
f c b d e g a
№5
Fat came into the baker's shop. He wanted to buy some buns and rolls, but there were nither rolls nor buns. He was very sad. He went to the grocer's where he met Mrs Pie who tought him how to cook buns.At the evening he told that to Funny.
№6
--Hello, little boy.Why are you so sad?
--Hello, Madam. I'm sad because there are no rolls or buns in the baker's
--Ah, really? Such a pity. I really like buns. Could you please take some floor and sugar. Let's go to my house. I'll teach you how to cook buns! That is that I usually do. I don't buy buns, I bake them.
--Thank you very much!
№7
They are simmilar to me.  And I don't have friends.