The words "racecar","kayak"and "level" are the same _____ they are read left to right or right to left.
考查连词的用法辨析。
句意：“赛车”、“皮艇”和“水平”这几个词无论从左到右读，还是从右到左读都是一样的。since 自从……以来，既然；though 虽然；unless 除非，如果不；whether 无论，不管。根据句意可知选选项D。
When you break the rules,you should _____ to your teacher.
句意：当你违反规则时，你应该向你的老师道歉。本题考查动词词义辨析。选项A项意为“道歉”，选项B项意为“介绍”，选项C项意为“期待”，选项D项意为“比较”。根据句意可知选选项A。
_____ you must go and play football,at least wait until school is over.
本题考査连词的用法。句意：如果你必须去踢足球，至少要等到放学。表示 “如果” 要用连词 if，if 引导的是条件状语从句，故选A。
The fridge doesn't work. Why not consider _____ a new one?
本题考查非谓语动词的用法。
句意：冰箱坏了，为什么不考虑买一台新的冰箱呢？consider 意为“仔细考虑”，后接动名词作宾语。故选选项D。
Hurry up,_____ you can't catch the early bus.
句意：快点儿，否则你就不能赶上早班车了。so “因此”，表示结果；and “并且、和”，表示并列；or “否则”。结合句意，此处表示“否则”，故选选项C。
— I think Karen should go swimming with Kate.
— If she ______,she will have great fun.
— What do you think of talk shows?
— _____. They're boring.
考查情景交际。句意：—— 你认为脱口秀如何？—— 我受不了，它们太无聊。选项A，我无法忍受它们；选项B，我喜欢它们；选项C，我不确定；选项D，没问题。由答语“它们太无聊”可知，前句是“我无法忍受它们”，故选选项A。
Our classroom _____ by students every afternoon.
考查时态和语态。句意：每天下午学生们把我们的教室打扫干浄。根据时间状语 every afternoon 可知，该题用一般现在时；classroom 与 clean 之间是被动关系，因此本题用一般现在时的被动语态。故选选项A。
She is still angry and refuses to _____ my apology.
考查动词辨析。
句意：她仍在生气，拒绝接受我的道歉。enjoy 喜欢；choose 选择；develop 发展；accept 接受。由句意可知选选项D。
— The picnic is only in three days. Have you made any plans?
— Not yet,so let's _____ what to prepare.
考查动词辨析。
句意：—— 离去野餐只有三天时间了，你做好计划了吗？—— 还没有，那么我们来讨论一下准备什么吧。wish 希望；discuss 讨论；repair 修理；suppose 推断。由句意可知选选项B。
I didn't mean to trouble Curry yesterday. It was pouring with rain so I _____ his offer of a lift.