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50. The farmers were working in the field when the clouds ______them that a storm was coming up were on their way.

A. warned　　　 B. to warn　　　　 C. warning　　　　 D. warn

49. _____ I am willing to help, I do not have much time available.

　 A. When　　　　 B. While　　　　　 C. Since　　　　　 D. Where

48. Many people now make _____ a rule to buy gifts for friends before Christmas.

　 A. this　　　　　 B. that　　　　　　 C. it　　　　　　 D. which

47. John as well as five other students _____ to school early every day. 　 A. have gone　　 B. has gone　　　　 C. go　　　　　　 D. goes

46. “You _____ be able to speak French for this job,” he told me at the interview.

　 A. must　　　　 B. may　　　　　　 C. can　　　　　 D. need