_ is known to the world, Mark Twain was a great American writer.

I haven' t been to a pop festival before and Mike hasn' t __

You'd better take these documents with you __ you need them for the meeting.

If their marketing team succeeds, they __ their profits by 20 percent.

Nowadays little knowledge __ to be a dangerous thing.

My father asked __ to help with his work.

He pointed at the new car and asked, "___ is it? Have you ever seen it before?"

Jonathan and Joe left the house to go for__ after supper.

Don’t ask him how old he is. He’s really ____about it.

The clock has stopped. I ________ get it go again and set the alarm, or I will be late again tomorrow.