The relationship between Chad and the Sudan is not______and so the border crossing is particularly difficult.

A．Food is no longer a basic need for us, while it was for primitive people.
B．We eat a wide variety of food.
C．We no longer eat fruit that primitive people ever ate.
D．We eat more food than primitive people do.

A．People are expected to come at six.
B．A formal party will be held.
C．It will be a party for relaxation.
D．There is no need to prepare special clothes.