---Most hotels are very full today.

--- Don't worry!  I have ______ a room already in the Changjiang Hotel.

A．bought

B．booked

C．visited

D．seen

在下面横线上填上适当的语句，完成程序。
#include ＜iostream＞
using namespace std;
class Base

int x;
public:
Base(int i) x=i;
～Base()
;
class Derived: public Base

public:
______∥完成类 Derive 构造函数的定义
;
int main()

Derived Obj;
return 0;

在横线处应填入的语句是 【11】 。