_________， I have to put it away and focus my attention on study this week.

依次填入下列各句横线处的词语，恰当的一组是（ ）①除了低迷的战线影响士气，大环境欠佳也让球员对未来感到 。②绿豆中的这些蛋白质能够与汞、铅等重金属结合成 物，以排出体外。③随着运输条件的改善，外地客商纷至沓来，使这片原本 的土地逐渐热闹起来。

If there is any change to the plan, I ______ you as soon as possible.

Peter _____ come with us tonight, but he isn’t very sure yet. [ ]

When did he start ________the instrument