用所给词的正确形式填空。
【小题1】The bag is lighter (light) than that one.
【小题2】I’m sorry to say that there’s nothing to eat (eat).
【小题3】When I visited them at 7 o’clock yesterday, they were chatting (chat) by the fire.
【小题4】There are many boys playing (play) on the playground.
【小题5】We must send a letter to her. A letter must be sent (send) to her.
【小题6】What you said makes me confused (confuse)
【小题7】He needs to spend (spend) time with friends.
【小题8】An ad can lead you to buy (buy) something you don’t need.
【小题9】She has lived (live) here since three years ago.
【小题10】Receiving (receive) money makes me unfortable.
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解析：
【小题1】两者相比用比较级：lighter
【小题2】用动词不定式作后置定语，修饰nothing
【小题3】时间状语从句说的是昨天7点钟，故那时他们正在聊天，用过去进行时：were chatting
【小题4】现在分词作定语，表示动作正在进行（正在发生）。故填：playing
【小题5】A letter作主语，用被动语态：be sent
【小题6】句意为“你说的话让我困惑。”故填动词confuse的形容词：confused
【小题7】need作实义动词的常用结构为：人+ need to do ；物+ need doing.故填to spend.
【小题8】lead sb to do “导致某人做…”是固定结构
【小题9】根据时间状语since three years ago ，本句要用现在完成时。
【小题10】动名词作主语