I will have to study very hard, _____ I can pass the exam.
(A) such
(B) therefore
(C) in order
(D) so that
I cannot concentrate, here is too much __________.
(A) detraction
(B) distraction
(C) people
(D) sound
(D) contraction
Synonym of “lodestar” is _________?
(A) guiding principle
(B) burden
(C) optical illusion
(D) symbol of authority