---Did you ask Sophia for help? ----I ______ need to- I managed perfectly well on my own.

All of us must do_______ to help protect the environment，or we will have more hazy weather雾霾天气.                                    

The public transportation is very convenient in that big city , so there______be any difficulty in traveling around .

—What do you think of Peter?—He ______ be really difficult to get along with even though he’s a nice person in general.

—Li Lin took the 8:00 bus to Fuzhou this morning.—Really? He _________ a fast train. It’s much more comfortable to travel by fast train.