It was (such/ so) a hot day that I went swimming.
such
The pizza was (so/ such) delicious that I ordered another one.
so
This bag looks new but it (wasn't designed/ isn't designed) two years ago.
wasn't designed
This novel (wrote/ is written) by Shakespeare.
is written
A: I'll help you. B: (How/ What) nice of you!
How
Students (must/ need) wear school uniform to attend school.
must
Mobile phones (are/ is) used by millions of people nowadays.
are
You (don't have to/ mustn't) cook. We have a lot of food in the fridge.
don't have to
(What/ How) wonderful news she told me!
What
Cotton (is/ are) used to make clothes.
is
A: Are we meeting up later? B: No, I'm (so/ such) tired that I don't want to leave the house.
so
You (mustn't/ must) smoke here. It isn't allowed.
mustn't