1 ______the world began,nations have had difficulty in keeping perce with their neighbours.

1 ______the world began,nations have had difficulty in keeping perce with their neighbours.
A Although B When C Until D Ever Since
2_______difficuities we may come across,we will help one another to get over them.
A Whatever B Whichever C However D What
3 I am pleaped with what you have told me and ____ you have given to me.
A all what B all that C which D all whatever
4 The time will surely come_______ordinary people could operate computers as well.
A while B when C as D on which
5 ______he came to England to study,he didn't know how to cook.
A When B Since C Until D yet
顺便说下so ,so that 有什么区别.