what is on what if what for what is up 这都什么意思

what is on what if what for what is up 这都什么意思 If a house is on fire.what shall we do? what is going on what is on? what is w.f.l what if i have 100w what if it is是什么意思 初二暑假作业本中的几道英语脑筋急转弯1.what did the fly say when it landed on the book?2 What is 10+5 minus 15?what is 3+6 minus what is 17+3 minus 20?3.If wife went to Washing while Washington's washwoman Washington's Washington's w what holiday is on december what is on the quilt what is on the table What hell is going on? What on earth is rap? What is on it?急 what is going on here what is happiness on earth? what is on duty today? what is happening on venus