The public transport system in Beijing is very good now, so there _____be any difficulty in traveling around the city.
——I’m terribly sorry for being late.——________. Come over and sit down.
I can't believe what he says because he is _______ changing his mind. .
Linda had her luggage________ an hour before her plane left.
Could you drive me to the bookstore at noon if________?
In my opinion, it's the flying birds rather than the pilot that________for the air crash.