根据首字母提示填写单词所缺部分，使句子完整。

小题1:There’s nothing in the bottle. It’s e____________.

小题2:Please k_________at the door before coming into the room.

小题3:At the beginning of 18^th c_________, the population of the world was very small.

小题4:I’m very h_______. Please give me something to eat.

小题5:Mary looks unhappy. Let's have a try to c_________her up.

排列D3→D17进路，当D13FKJ故障时下列说法正确的是（）。

A.D3能开放，D9不能开放

B.D3不能开放，D9能开放

C.D3不能开放，D9不能开放

D.D3能开放，D9能开放