下列各句中，表达得体的一项是

Harry lived in London for three months,______ he learned some English.

So difficult ________ it to live in an English-speakingcountry that I was determined to learn English well．

I’m not ____ my best tonight. I’d better not have anything for supper. Perhaps you’d_____me some tea.

________you were coming，I would have stayed at home.