—Is that your grandpa ?—Yes, although he is very old ______ he works very hard.
----Hello! May I speak to Mr. Zhang? ----Sorry, he’s out. Can you ______a message?
The 20th World Cup will be held in Brazil _______ June 12 _______ July 13, 2014.
----Where is Jack? ----On the playground. He _______ football with his classmates.
------ How many people were invited to the meeting? ------About six ________.
Cars make our life easier, _________ they bring environment problems.