I want to see him       he arrives. Which of the following is wrong.

 --- How long ____ was this? --- It’s been nearly six years now.

____ to the surprise of the teachers, the naughty boy turned out to be the person who saved the dying girl. 

 When you feel you are happier and more relaxed after having a cigarette, you may become ________addicted.

Most of the evidence was destroyed in the fire. _____, it would be almost impossible to prove Jim guilty.