用所给词的适当形式填空

1. Look! Whose ________ (Walkman) are these? Perhaps they are the twin's.

2. Is there an ________ (electric) shop in your town?

3. Amy wants to buy some presents for ________ (they).

4. Do you understand the ________(mean) of the new world?

5. Do you like to have cold ________ (drink)?  

6.We usually go ________ ( shop )on Sundays.

7. Listen !Someone ________ ( knock )at the door.

甲（15周岁）、乙（18周岁）合谋绑架人质，在甲去取赎金时，乙未与甲商量便杀害了人质。几个月后两人又绑架了一名人质，在取到赎金后，又将人质身上的1000元现金抢走。甲的行为（）。

A.前后两次均构成绑架罪

B.前一次无罪，后一次构成抢劫罪

C.前一次构成故意杀人罪，后一次构成抢劫罪

D.前一次构成绑架罪，后一次构成抢劫罪