do you go to work every day -By bike.

Was it an accident or did David do it ________?

Mr. Green didn’t post the letter _________. He asked his son to do it for him.

The girl had been suffering from the lung cancer, yet she acted as if nothing__________ to her while we were together.

The plane will arrive ______ Shanghai ______ 8:00 _____ the evening of September 10.