The country ____________ diamonds.

1.   ?    be rich in
2.   ?    take care of
3.   ?    with the help of

Crop-growing and shopkeeping are __________ traditional ways to earn a living.

1.   ?    decide on
2.   ?    be likely to
3.   ?    more or less

_________ two guards at the zoo, there is now only one.

1.   ?    be packed with
2.   ?    instead of
3.   ?    on duty