Without the ‘ greenhouse effect’, the earth ____ be about thirty-three degrees Celsius cooler than it is.

_____ you come to Brunei, you would have to take off your shoes before going inside someone’s home.

If I hadn’t stood under the ladder to catch you when you fell, you _____ now.

 The lesson drawn from the coal mine accidents is that safety measures are so important that we _____ take them too seriously.

 Mr. Li, a man calling himself Smith wants to see you. ________ he come in?