从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
1.— I'm nervous about the English Presentation.Could you give me some advice?
— _________
A.Forget it B.I hope so C.No way D.No problem
2.We never know the love of our parents _________ we become parents ourselves.
A.when B.if C.until D.though