语法题--填入适当形式-请一定详解,

语法题--填入适当形式-请一定详解,
39.I don't know __________ (ask)the question or not.
40.He appeared well __________ (prepare)for the TV debate.
42.__________ (long) I can stayis three hours.
45.The picking of the fruit,__________(which) work they receive no money,takes about a week.
47.- Have you met our German neighbours?
-Are they __________ (one) who moved here recently?
42.为什么不能是the longest time？

39. I don't know (whether to ask) the question or not.
40. He appeared well (prepared) for the TV debate.
42. (The longest) I can stay is three hours.
45. The picking of the fruit, (for which) work they receive no money, takes about a week.
47. - Have you met our German neighbours?
- Are they (the ones) who moved here recently?
其实 42 也可以填 the longest time ,但 time 通常被省略.
我是加拿大人,前英语老师.
再问： 39.填whether to ask ，是因为whether就像how ，what 之类的词后接“动词不定时”，对吗？ 40.原因appear 是连系动词，后面接形容词，所以用prepared，对吗？ 45, which前为什么加for呢？是后面那个短语带for？将其提前了呢？ 47，为什么是the ones 呢？我不太理解，请您详细说明，非常感谢！
再答： 39 填 whether 原因是后面的 or not 。 whether ... or not 是固定搭配。 40 prepared 是分词，这里有形容词作用。 well prepared = 准备好了。 45 句子如果改写为 The picking of the fruit, (for which) they receive no money, takes about a week. 或比较清楚。 Which 是指 "the picking of the fruit" work 通常省略。 47 ones 是代词， 指 “German neighbours" 。 比如： Are you the one who stole my bike? 相等于 Are you the person who stole my bike?
再问： 39.填 whether 原因是后面的 or not 。 whether ... or not 是固定搭配。 这一点，我知道，然而，我不清楚的是---whether后为什么是to ask？ 是否类似：Look at how to do this next. 中的how 后面的to do 呢？ 谢谢您！O(∩_∩)O
再答： 句子的另一个形式是 I don't know whether or not to ask the question. 把 or not 放在 ask the question 后面 给 ask the question 强调性， 句型不同，但意思一样， 再给个例子： I don't know whether to cry or not = I don't know whether or not to cry 这里，把 to cry 放在 whether 后面的原因是要强调 to cry 。