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Choose the correct form to complete the sentences.
1 Everything reduced by 50 per cent or more
We (must be/can't be) crazy to offer such bargains!
2 Everything half price! It (must be/can't be) a great sale
3 let's have a look, there (can't be/might be) something
4 There's 75 per cent of this jacket. It (may be/must be) a
bargain, but I don't like it!
5 l agree! It's horrible! lt (can't be/might be) a best seller!