Bob is ________ eleven-year-old boy, but he knows a lot about the Internet.

The Maths problem is so difficult that _______ students can work it out.

It’s ____ cold. Would you please closeall the windows— OK. I’ll do it now.

advertising can increase sales ofproduction, _____it can _____the price

So noisy____ in the dining hall that he could onlymake himself heard by shouting at the top of his voice.