________ the plan many times, but he still didn't understand．

A．Having told him

B．Having been told him

C．Though he had been told

D．He was told

When he got home, he found the door ________, the window ________, the money and the necklace in the drawer ________．

A．shut; opened; stolen

B．shut; open; stolen

C．shut; open; steal

D．shuted; open; stolen

________ of my classmates could work out the maths problem because it was too difficult．

A．Each

B．No one

C．None

D．Any

He kept looking at her, wondering whether he ________ her somewhere．

A．saw

B．has seen

C．sees

D．had seen

Helen ________ it if she doesn't want to．

A．doesn't need do

B．need not to do

C．needs not to do

D．need not do

The ________ doctors are carrying ________ boxes．

A．woman; paper

B．women; papers

C．woman; paper's

D．women; paper

Don't worry．I'm sure you'll succeed ________ if you work hard．

A．on time

B．in time

C．at times

D．ahead of time

He didn't go by bike with me．That's ________ there was something wrong with his bike．

A．because

B．why

C．how

D．when

So sudden ________ that the enemy had no time to escape．

A．did the attack

B．the attack did

C．was the attack

D．the attack was

He made up his mind to devote his life ________ pollution ________ happily．

A．to prevent; to live

B．to prevent; from living

C．to preventing; to live

D．to preventing; from living