They have ________ since the factory opened.

I think it’s impossible for us to work out the plan in just two days. It’s too difficult. —You’re right. We can’t be _______ careful while working on it.

My room gets very cold at night.–__________.

I have never dined with you, sir; and I see no reason.

75% of the students ______that the number of private cars _______ increasing rapidly. [ ]