选词并用其适当形式补全句子。
1. I need ___________ to bed early, because I leave for Beijing tomorrow.
2. Let's help mother ___________ the house.
3. This pair of ___________ is old. I don't need it.
4. How many ___________ do you have?  I have five.
5. May I ___________ you?  Yes, please.

【考点】动词不定式,复数名词,情态动词,实义动词

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