New words：

volunteer [.vɔlən'tiə]
n.志愿者；志愿兵；义务工作者；自告奋勇者
v.自愿做；义务做

Sample Sentences：

The soldier volunteered for guard duty.
They volunteered to repair the house for the old lady.

Can I have a volunteer to wash the dishes?
Volunteers were ready and waiting to pack the food in boxes.

New words：

joy [dʒɔi] n.快乐；欢乐；乐事；喜悦

Sample Sentences：

I saw the joy in her smiling face.
Learning English is my great joy.
On a hot day, a cool swim is a joy.
I felt as if my heart would burst with joy.

New words：

pride [praid] n.骄傲；自豪；自尊；傲慢

take pride in sth 为…感到骄傲；引以为豪

Sample Sentences：

I take pride in my work.
Their son is their pride and joy.
She takes great pride in her children's success.
I think you hurt his pride by laughing at the way he speaks English.

joy [dʒɔi] n.快乐；乐事；喜悦

New words：

grammar ['græmə] n.语法；文法

Sample Sentences：

I have made a mistake in grammar.
I know nothing about Latin grammar.
I find German grammar very difficult.
The book explains grammar simply and clearly.

New words：

strength [streŋθ] n.强度；力量；实力；力气；体力

Sample Sentences：

Union is strength.
The medicine has lost its strength.
He hasn't got enough strength to remove that stone.
He's saving his strength for the last part of the race.