As he works in a remote area, he visits his parents only__________.

Scientists will have to come_______ new methods of increasing the world’s food supply.

. Tommy’s parents thought he was at school, but _______ he was in an Internet bar. 

We have saved some money,but it’s __________ not enough to buy a new house.

It is well known to all that a machine needs fuel to run;    ,man needs food to live on.