—Come on, please give me some ideas about the project.—Sorry. With so much work __________ my mind, I almost break down.
He is not easy-going, but his trust in his friends will last forever once _______.
The reason ____ he was late for school was _____he had to send his mother to a hospital.
_______ I’m not sure of winning the match, I will have a try anyway.
Doris’ success lies in the fact _______she is co-operative and eager to learn from others.
The system of Braille is really _____________ to the blind.