You [ ] the deadline because we're almost ready (to postpone) [ a) mustn't have postponed b) needn't have postponed c) should have postponed ]	needn't have postponed
We are quietly confident the project [ ] by the end of the year (to finish) [ a) may have finished b) could finish c) might have finished ]	may have finished
If we haven't received anything yet, our supplier [ ] out of stock (to be) [ a) might be b) should be c) ought to be ]	might be
We're not satisfied with the terms so we [ ] the contract today (not to sign) [ a) will have signed b) are signing c) won't be signing ]	won't be signing
They have checked and confirmed we [ ] any problems with delivery (to have) [ a) might not have b) shouldn't have c) mustn't have ]	shouldn't have
The design of this product is so ugly it [ ] a prototype (to be) [ a) should be b) can be c) must be ]	must be
This product looks so unreliable it [ ] ready for sale (not to be) [ a) ought to be b) can't be c) shouldn't be ]	can't be
The price was so low they [ ] their stocks in a single day (to sell) [ a) must have sold b) could have sold c) may sell ]	(must|could) have sold