---The light was on all night long. ---Yes. It seemed that Mike ________. He was the last one to leave the office.

 The priest made the ________ of the cross when he entered the church.

 David had prepared carefully for the chemistry exam, as he wanted to be sure of passing it at the first _____.

Teenagers are often treated like _____bigger children, but they are old enough to beindependent.

(2013·山东省胶东示范学校二模)—It's dangerous to take photos of lightning.—The challenge is not for ________， but I think it's worth  attempting.