The computer system ______ suddenly while he was searching for information on the Internet. [ ]

Houston Rockets, ______ led by as many as 10 points in the first half, has dropped three straight after winning eight matches.

She is my best teacher ______ help I have made great progress．

“______ that again!” My father shouted to me when I was found playing with fire.

He decided to ______for the new position after he took everything into consideration.[ ]