16.It is no doubt that once ____ this city, you’ll find that there is so much surprise waiting for you to discover. visit B. visiting C. visited D. to visit
“When _____ he come?” “I don’t know, but when he _____, I’ll tell you.”
I had hoped to see her off at the station, but I _____ too busy.
I don’t know if she _____, but if she ____ I will let you know.
My friend Mary is _____ beautiful girl and _____ girl everyone likes to work with.
. He is very busy. I don’t know if he _____ or not tomorrow.