Online computer systems help us provide a() service to our customers.

单项选择题In general most workers were in favor of a(n) () scheme offering financial rewards.

单项选择题The secretary ( )that she has stolen the letter.

单项选择题Did he ( )you a gift last Sunday?

单项选择题It was on the beach（）Miss White found the kid lying dead.

A.it
B.that
C.which

单项选择题What are the main factors that contribute to good health？（）

A.Do regular exercise and develop good living habits
B.Balance the diet and have a proper meal plan
C.Have a positive attitude
D.All of the above