He sent me an E-mail, _____ to get further information.
The teacher demanded that the exam _____ before eleven.
He had a strange hairstyle and he instantly became the ________ of attention the moment he stepped into the classroom.
—How do you find this new movie? —It's ________ interesting than expected.
It took us several hours to make the old man ________ of the safety of travelling by air.
No one can ________ how the election will turn out,as there are many unknown facts.