----Each of the students, working hard at his or her lessons,___to go to university.-----So do I.
The boss appeared ______ the accident and was not surprised at the news.
________ a vocation, and you’ll forget unhappy things
---Why do you look so upset? ---There are so many troublesome problems _____.
The cancer risks ___________ smoking have been well documented.
They are purely __________ weapons, not designed for attacks.