从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
1．—I’ve studied growing plants as one of my interests. Could I make some suggestions?
— ______.
A. You will make it B. Go right ahead. C. Don’t mention it D. Take it easy
2. We had to wait half an hour _____ we had already booked a table.
A. since B. although C. until D. before
