In crowded places like airports and railway stations, you     take care of your luggage.

 All the _________ things need air and water. Without air or water, nothing can stay _______.

1 often take a bus to school, but _____I go to school by bike.

His parents were worried that he        too much time chatting on line. 

 ---When shall we start, today or tomorrow?---          is OK. You decide.