根据句意、汉语提示或首字母和英文释义写出单词的正确形式。
They enjoyed ______________(他们自己) in the park..
When I met her, I realized that I had  ____________ (忘记) my book at home.
I feel bad that I didn't ______________(提供)any food to them.
An old friend of  _____________(她的) came to see her yesterday, She was unexpected.
Spitting in public places is bad _____________(举止).
I had already ___________(建议) him not to do like this, but he didn’t listen to me .
I feel ____________ (骄傲的) to be a part of the team.
The truck was traveling at a _____________(速度) of 50 mph.
He has two p__________ to be operated on.
She lives by herself and often feels l___________.
The teacher told us that light______________(travel) much faster than sound.
It’s necessary for us _________________(do) some exercise before the final exam.
We _______________ (run) outside when you called us at this time yesterday.
---Why not ________(buy) a toy car for your son? ---Good idea. He must like it very much.
Linda spends as much time as she can _______________(practise) reading English.