________ you stepped into the lab with your shoes on? You’re supposed to take them off before you enter it. I told you so!
-----Could you do me a favor ? ------It depends on _____ it is .
After hearing the bad news, Susan found herselfof it from time to time while at work.
—made your daughter decide to go to Tibet as a volunteer? —Mr.Lee’s speech.
thousands of families from the earthquake-stricken area have moved into new houses is exciting news.
—Charlie has been nowherefor three days. What has happened to him? —Didn’t you know he had gone to Hong Kong?