The son thanked his mother _________ helping him __________ his lessons and he gave his mother a kiss.
A.for…with B.with…in C.of…about D.on…at
They had to go out and hunt for food to keep themselves __________.
A.live B.life C.lives D.alive
It took me __________ to walk to the Century Park last week.
A.one and a half hour B.one hour and a half
C.one and half hours D.one hour and half
__________ people in the world are sending and receiving e-mails every day.
A.Million of B.Several million of
C.Millions of D.Several millions
We should learn from him and think less of __________ than others.
A.us B.ourselves C.our D.ours
Trees are _______ biggest and oldest living things on the earth.
A.a B.an C.the D./
