There is not much time left，but________we must get there on time

I can’t solve the math problem because it is too difficult. What should I do — _________ ask the teacher for help

If you are _______ about Australian cities, just read the book written by Dr. Johnson.

Alice _____ her father that both she and her husband would be happy if he would live with them.

填入下面空缺处的语句，最恰当的一项是（ ）夜深人静的时候，绝大多数人都已进入梦乡，对父亲来说，却正是忙碌的时候。处理完一天积攒的信件之后，_____________父亲珍藏了几十万册古今中外的图书，但是他求知若渴，常常苦于无书可读。于是他身边的工作人员常去书店买些新书，或者从各种报刊上剪下一些科技新知识和各类资讯，送给父亲阅读。因为知道父亲爱书，所以来访的客人也会带些自己的新作或最近出版的著作送给他。这是父亲顶喜欢的礼物，他几乎都会照单全收。