Choose the best anwser

1,The manager sounded a of warning about the hidden dangers of working overtime
A. Tone
B. Key
C. Note
D. Pitch
2, Laura broke her arm when she   the hill
A. Has climbed
B. Climbs
C. Is climbing
D. Was climbing
3, If  at reasonable prices, these products would go like hot cakes
A. Sell
B. To sell
C. Sold
D. Selling
4, Martin seems to have a   for teaching. He's patient and has really good communication skills
A. Post
B. Office
C. Career
D. Vocation
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