农民工的养老保险费由用人单位缴纳。
参考答案：错
解析：养老保险费由用人单位和农民工共同缴纳。
We'll go to the farm and help the farmers with the apple-picking if it _____ tomorrow. [ ]
A. won't rain
B. will be rainy
C. doesn't rain
D. isn't raining
