5. Why do you suppose that Tom decided to finally let Wilson have the car he had been promising him?

 He had discovered that Myrtle had some sort of life apart from him in another world and the shock had made him physically sick.

 TOM因为Wilson的话受到了惊吓，以为Wilson知道了自己和他妻子偷情的事情，因此我觉得他把车给他带着一种补偿或者害怕的心理。

6. What indication is there at this point that Tom means quite a bit to Myrtle?

In one of the windows over the garage the curtains had been moved aside a little and Myrtle Wilson was peering down at the car. So engrossed was she that she had no consciousness of being observed and one emotion after another crept into her face like objects into a slowly developing picture. Her expression was curiously familiar—it was an expression I had often seen on women’s faces but on Myrtle Wilson’s face it seemed purposeless and inexplicable until I realized that her eyes, wide with jealous terror, were fixed not on Tom, but on Jordan Baker, whom she took to be his wife.

由此可见Tom对她来说意义重大，因为她极度恐惧各种心情都出来了。当她误认为Jordan是Tom的妻子的时候。

7. Besides Myrtle’s, what other eyes “kept their vigil”?

the giant eyes of Doctor T. J. Eckleburg

8. As always, there is a grain of truth in what Gatsby says. In what sense is he an Oxford man? 

‘It was an opportunity they gave to some of the officers after the Armistice,’ he continued. ‘We could go to any of the universities in England or France.’