Tom graduated from college at a very young age.—Oh, he ______ have been a very smart boy then.[ ]

u sure you won’t come for a drink with us-,if you insist

The main roads of city have been _____.[ ]

When changing lanes, a driver should use his turning signal to let other drivers know____. [ ]

My parents have made clear that they won’t support me in leaving school to open a company.