语音 (共5小题；每小题1分，满分5分） 从A, B, C, D，四个选项中选出划线部分读音与其它三个不同的一个，并将其字母代号填入相应题号的括号内。
_______he is busy, ________he helps us often.
Your child is only five. Is _____necessary for you to be so strict with him?
My mother always has__________ housework to do on weekends.
It’s important ______us to learn English well.
Liu Lei is ________better at Chinese than Liu Ying.
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