Question

The twins are singing in the room now.改为同义句The twins are singing in the room ( )

The twins are singing in the room now.改为同义句The twins are singing in the room ( )
His sister is fifteen years old .I am tweleve years old.改为同义句I"am ( )than his sister.
Alex spends two hours playing sports every day.改为同义句（ ）Alex two hours ( ) play sports every day.
Exercising every day is very important for students.改为同义句（ ）is very important for students ( ）every day.

Answer 1

The twins are singing in the room (at present).
I'm (three years younger)than his sister.
（It takes）Alex two hours (to) play sports every day.
（It ）is very important for students (to exercise）every day.

Answer 2

at present
three years younger
(It takes) (to)
（It) (to exercise)

Answer 3

currently
three years younger
It spends to
Exercising health