A.As long as Mike follows his parents' advice on choosing his career, he won't regret.
B.If only Mike followed his parents' advice on choosing his career.
C.If Mike had followed his parents' advice on choosing his career, he would regret it now.
D.Mike wishes he had followed his parents' advice on choosing his career.

A.As long as Mike follows his parents' advice on choosing his career, he won't regret.
B.If only Mike followed his parents' advice on choosing his career.
C.If Mike had followed his parents' advice on choosing his career, he would regret it now.
D.Mike wishes he had followed his parents' advice on choosing his career.

A.But for the first flu vaccination, there wouldn't be a reliable protection against flu in this country.
B.Not until the researchers developed the first flu vaccination recently was there a reliable protection against flu in this country.
C.So reliable was the protection against flu in this country that the researchers developed the first flu vaccination recently.
D.Scarcely the researchers developed the first flu vaccination recently when there was a reliable protection against flu in this country.

A.\(4x + 9y--13 = 0\)
B.\(2x + 4y--5 = 0\)
C.\(x + y + 5 = 0\)
D.\(16x--15y + 100 = 0\)

A.75%.
B.85%.
C.90%.
D.80%.

A.80%.
B.90%.
C.95%.
D.50%.

A.0,81.
B.0,96.
C.0,78.
D.0,04.

A.other
B.another
C.others
D.each

A.Moreover
B.In fact
C.However
D.Therefore

A.unemployed
B.excited
C.surprised
D.exhausted