--- Are you pleased with what he has done?--- Not in the least. It couldn’t be __________.

When a customer withdraws money from the bank, it is required to leave his signature. But how can we be sure it is_______?

The research lacks  evidence, and therefore, its conclusions are doubtful.

One of the suspects is _________ schoolboy.

According to the statistics，young drivers are more ________to have accidents than older drivers.