I looked this question up and, in one of the sites where I found it, each number had two answer choices. Just in case, I will use them here.
1.
A. She may / might / could be working too hard.
B. She must be working too hard.
2.
A. He must not earn very much.
B. He may not / might not earn very much.
Answer:
The answers are:
1. A. She may / might / could be working too hard.
2. B. He may not / might not earn very much.
Explanation:
The modal verbs "may", "might" and "could" are used to express possibility. Therefore, they do not convey much certainty, that is, the speaker is not 100% sure of what he / she is saying, but he / she knows there is a possibility of being right.
That is why those verbs are the best ones to complete the sentences above. In both cases, the speaker is supposing, assuming something. In the first sentence, the speaker believes it is possible that Deborah is tired because she is working too hard. In the second one, the speaker assumes "he" is likely to not earn much because he never goes on holiday.
Note: "Could" is also used to express ability in some cases.
A. When and where the author was born
C. The author's successes and failures
He is presented as a loyal and heroic warrior who had no apparent lust for power. However, the flames of ambition could be seen when he uttered "tell me more" after the witches prophecy. The prophecy, however, is half finished and he is responsible for finishing it off himself. Thus, the main plot is set in motion and is a chilling foreshadowing of the influence of power and the corruption it has, even on a "good" person like Macbeth. Macbeth is seriously conflicted between a number of possibilities. He seriously considers letting fate take its course ("If chance would have me king, why then let chance crown me."), taking agressive action ("Prince of Cumberland! That is a step on which I must fall down or else o'erleap for in my way it lies."), and doing nothing and disregarding the prophecy ("We shall proceed no further in this business.") What drives him to commit the murder is not "vaulting ambition" but his fear that his wife will consider him less than manly.
Answer:
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Book titles would be the correct answer.