When she was in trouble, I did what I could to help her. my help, she wrote me a letter of thanks.
The girl in the photo was smiling sweetly, ________.
Electronic products are ________ must for new generation of ________ college students.
—Are you finishing your task?—________. We need no less than three hours more.
The novel written by the author ________ best, but five years ago no one could have imagined how great a role he ________ in the literary world.
The accident was my fault, so I had to pay for the damage ________ the other car.