Although the first part of the book is easy, the rest ______.
— Tod hadn’t passed the exam and was afraid of being scolded. — _____.
The manager decided to give the job to ____ he believed had a strong sense of duty.
The factory produced many famous cars, none of ____ shipped to foreign countries.
Lei Feng is always ready to help others when they are in trouble and he never _______ their request.
How I regretted ___the hours in the forest, ___I should have studied hard in the classroom.