I have waited for the bus for twenty minutes.(对画线部分提问)________________ have you waited for the bus?
It's important for everyone to know how to ask for help . (polite)
Grace loves dancing. She wants to be a when she grows up. (dance)
将划线部分的英语译成汉语,注意使用适当的形式.
Building a beautiful countryside is what we hope for and what we'll work hard for.
I like taking a walk in the bamboo forest because the air there is clean and fresh.
根据句意,用括号中所给词的适当形式填空,
To better understand the habits of elephants, the government spent a lot of money doing (科学研究).