________ to sunlight for too much time will do harm to one’s skin.
50. A doctor was___________when Mother fell ill.
49. You must go there at once because the situation prompt action.
48. Please _____ tomorrow, my number is 8855463.
47. ____ in thought, he didn’t notice me when I came into his room.
46. The house _____ in 1808 still remained there.