We were all doing our history paper in the classroom yesterday evening________the light went out[ ]

________is no doubt that today greenhouse gases are the largest human influence on global climate

People say, “Guilin’s scenery is matchless in the world.” It was not until I visited the place _____ I found it really worthy of the reputation.

To discourage the young man from quitting the job, the manager ________ many promises like salary increase and quick promotion.

The old temple ______ roof was damaged in a storm is now under repair.