Don’t leave matches or cigarettes on the table within ____ of little children.
51. They planned to go to Beijing for sightseeing, but because of their daughter’s unexpected illness they had to stay at home _____.
50. The lazy boy got up very late and went to school in a hurry. When he arrived at school, he found that he had put his socks on _______.
49. --- Does he study very hard at school? --- Yes, he studies _____.
48. I will ask my father to telephone you _____ he comes back.
47. I'd like to go with you. , I have to finish the report now.