I. 单项填空(共20题;每小题1分,满分20分)
1. This experience shows that ____ good knowledge of first aid can make ____ real difference.
A. a, a B. a, / C. the, a D. the, the
2. Check your answers carefully and make some changes ___________.
A. if it necessary B. if you are necessary C. if is necessary D. if necessary
3. I finally got the job I had dreamed of. Never in my life ________ so happy.
A. did I feel B. I felt C. I had felt D. had I felt
4. Once a neighbor of mine accused me _____ playing my radio too loudly.
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