单项选择题

You must complete the enclosed form and return it within 30 days of purchase ______ you may activate the one-year replacement guarantee.

(A) what
(B) which
(C) because
(D) so that

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This ______ a small firm like ours to compete with multinational companies on a very global basis with very low costs.

(A) offers
(B) becomes
(C) accepts
(D) allows

单项选择题

Waterloo University itself makes a significant ______ to the creative activity of the village through its outstanding faculty and students.

(A) input
(B) gift
(C) contribution
(D) donation

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