根据句意及首字母（汉语）提示，补全单词

1. He remembers b____ encouraged by Mrs Parkes.

2. Grade 9 is          (庆祝) their victory now.

3. I have given up         (烟).

4. Many students look f____ to the vacation.

5. China is a d____ country.

设计实验探究X是否属于植物生长所必需的无机盐，某同学的构思大致如下：本实验中采用甲组、乙组之间的空白对照；以及乙组中实验前（无X）与实验后（有X）之间的自身对照。两次对照中属于实验组的依次是（）

A.甲组、乙组实验前

B.甲组、乙组实验后

C.乙组、乙组实验前

D.乙组、乙组实验后