Big companies usually have a lot of branch offices ________ in different parts of the world．

A．to have operated

B．be operated

C．operating

D．having operated

Portable videophones will show us ________ is happening at the other end of the line．

A．which

B．what

C．how

D．why

It was not until 1920 ________ American women had the chance to vote in national elections．

A．when

B．that

C．where

D．which

________ a wet football can hurt your foot if you are not careful．

A．Kicking

B．Kicked

C．Having kicked

D．Kick

Sailing across the ocean alone was an achievement ________ took courage．

A．what

B．who

C．which

D．where

Despite the fact ________ they lacked food, the explorers continued towards the goal．

A．which

B．that

C．what

D．whether

________ you take a photo, you should always check the position of the sun．

A．Before

B．After

C．Because

D．Though

Once ________, Jo devoted her life to looking after children and being a full-time homemaker．

A．having married

B．being married

C．marrying

D．married

People have learnt the importance of keeping a balanced diet ________ their nutritional needs．

A．satisfy

B．satisfied

C．to satisfy

D．having satisfied

Tom looked upon the test as an obstacle ________ his classmates regarded it as a challenge．

A．while

B．because

C．unless

D．if