As volunteers, they should do ______to help the children in trouble.
听见对方说了“Fine, Thank you. And you?”后,你应该说______
如果你想问一个美国朋友手中所拿物件的英文名称,你应该说______
与单词“eye”同音的字母是______。
— Your jacket is nice.— ______.
“I”和“O”是______。