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1. A (daily) (dose) of laughter (may be) good for the heart because, (as) exercise, it makes blood vessels work more efficiently.
請問括號內哪個錯, 要改什麼?

2. ____ struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.
(A)When is it (B)When it is (C)It is (D)That it is
請問答案是哪一個, 為什麼?

3. Thunder occurs as ____ through air, causing the heated air to expand and collide with layers of cooler air.
(A)an electrical charge
(B)passes an electrical charge
(C)the passing of an electrical charge
(D)an electrical charge passes
請問答案是哪一個, 為什麼?

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