A.danger
B.endanger
C.dangerously
D.dangerous

A.degree
B.licence
C.certificate
D.diploma

A.caught
B.fixed
C.lost
D.accustomed

A.glided
B.slipped
C.sailed
D.slid

A.hard
B.routine
C.simple
D.harmful

A.hard
B.routine
C.simple
D.harmful

A.boring
B.awful
C.dangerous
D.surprising

A.determined
B.changed
C.bold
D.hesitant

A.determined
B.changed
C.bold
D.hesitant

A.It is too troublesome to live on his own.
B.It is easier for others, not for him.
C.It enables him to gain balance in life.
D.He is enjoying the trouble that it brings.