请大家帮忙解释下这几个英语题～!谢谢

请大家帮忙解释下这几个英语题～!谢谢
1 If you don't come to the office,-----to your house and find out why you------at work.
A I go;won't be B I'll go; won't be C I go; are not D I'll go ;are not
2 You've agreed to go,so why aren't you getting ready?

But I-----that you-----me to start at once.
A don't realize ,want B haven't realized ,want C don't realize. wanted D didn't realize ,wanted
3 Having reched his journey's end, Carl hoped to find a hotel-----the night.
A to spend B to waste C to stay D to past
4 -----is a fact many smokers choose to ignore.
A That smoking is harmful health B To smoke is harmful to health
C It is harmful to health to smoke D Smoking is harmful to health
5 It can be said that it ----to invest more in education and scientific research.
A pays B costs C spends D takes
6 This pair of trousers isn't good, and that pair is -------better.
A rather B even C less D hardly
7 The secretary was asked to-----the waste paper on the desk.
A get rid of B rid C dispose D get out of
请帮忙解释下～谢谢 解释的好追加分哦

1.If you don't come to the office,----- to your house and find out why you ------ at work.
答案：B I'll go; won't be
条件状语从句中的现在时态是用来表示将来的,主句中前半句 go to your house 和 be at work无疑是表示说话后的行为,因此必须用 will go 和 won't be.(按规定,条件状语、时间状语、地点状语和让步状语只能用现在时表示将来.)
2.You've agreed to go,so why aren't you getting ready?
But I-----that you-----me to start at once.
答案：D didn't realize ,wanted
解析：没有“意识到你想让我马上出发”时说话前的事情,此刻由于听到对方责问 why aren't you getting ready 已经知道这件事,所以才会有“刚才不知道”的说法.
3.Having reched his journey's end,Carl hoped to find a hotel-----the night.
答案:A to spend
A to spend 花费或度过时间,这里的 the night 指晚上的时间.
B to waste 消耗或浪费时间
C to stay 停留在某地
D to past past 是介词,不可以用作动词
4.-----is a fact many smokers choose to ignore.
答案：A That smoking is harmful health
解析：该题考查对主语从句的掌握,句首主语从句中的主语无论是动名词还是不定式,引导从句的连接词 that 是不可以省略的.
5.It can be said that it ----to invest more in education and scientific research.
答案：B costs
解析：A pays 只能用人作主语,表示支付金钱,B costs 值得花钱 C spends 人作主语,表示花费金钱/时间/精力 D takes 值得花时间.
6 This pair of trousers isn't good,and that pair is -------better.
答案：B even
解析：只有 even,still,far,much,a lot 等副词才可以用来加强形容词比较级,rather,hardly 则不可,而 less better 是双重比较级,只能说 less good.
7 The secretary was asked to-----the waste paper on the desk.
答案：A get rid of the waste paper 清除/清理废纸
其他选项解析;
B rid desk of the waste paper .从桌子上清除废纸
C dispose the waste paper 使废纸派上用场
D get the waste paper out of the desk 把废纸从桌子上清理出去.