AIDS is said____the number one killer of both men and women over the past few years in that poor area, where no medical services are available.
Having arrived at the railway station, ______.
. Seeing her daughter came home safe and sound, the mother felt at ______.
We were all very much attracted by the beautiful scenery ______ we set foot in the village.
______ to strong sunlight for a long time will do harm to our skin.
I suggested to my father that we ______ to Shanghai for a holiday this summer,but the expression on his face suggested that he ______ to it.