Tony, my best friend, has done _______ he can to help me out of trouble.

         left the door unlocked must be held responsible for the accident.

Where is it ________ you picked up this watch?

 Please arrange an interview with the manager tomorrow , or      it is convenient to him .

All people in the company voted for Mr．Smith．His management and strong character as well as his kind-heartedness made _____ he was as CEO．