17. ____ computer use may not cause wrist injuries, it can still give you aheadache or make your eyes dry.(A) Once(B) When(C) While(D) Despite

26. What is the main purpose of the memo?(A) To announce the opening of a new branch office downtown(B) To invite staff members to an awards night(C) To persuade employees to participate in a special event arranged by BradJones(D) To announce the achievements of a co-worker who has been with thecompany for 32 years