Love your parents __________ they are alive． Don't wait until it is too late．（ ）
A．whileB．thoughC．becauseD．unless
Where is Jim？
Look! He _______ under the tree．（ ）
A．is standingB．stood
C．stands
My daughter is years old． Today is her birthday．（ ）
A．nine； ninethB．nine； ninth
C．ninth； nine
Is this your English book？
No， it's my brother's． is over there．（ ）
A．MineB．MyC．Me
My grandfather does Chinese Kung Fu every day _________ he is over eighty． （ ）
A．sinceB．thoughC．until
May I be allowed to choose a summer course？
It's up to you． You're ____ to make your own decision． （ ）
A．too oldB．enough oldC．old enough