—-Is it possible for us to meet at ten o’clock tomorrow morning?—-Sorry, it is certainly not. I       an important meeting then.

Although the peak travel time for Chinese railway doesn't start until Jan 19 this year, people who're eager to get a seat on the train _______ already _______ their struggles.

--Can I give you a call on Sunday?-- Sure, but I _______ to the mountains, so call me on my cell phone.

 ---I know you _____ for Shanghai. When shall I come to pick you up? ---The train _____ at 9:30, so you’d better come here at 8:30.

---- You haven’t got the textbook for my chemistry course yet. ---- I know, and we _____ to get it for the last 5 weeks.