—I am sorry to have __ too much of your time. —That's OK, and I am glad to help you.
______ the Chinese have been to Beijing.
We agree ______ here but so far she hasn’t turned up yet.
They ______ the train until it disappeared in the distance.
----- How long have you ______ the car? ----- For two months.
So far nothing _____ Tom. I want to know the reason _______ he hasn’t written to me.