Question

вставить wherever whatever whoever whichever whenever however


1....... they go their dog follows
them
2........ hard be tries he can't have a 5 in history

3 you can sit ......... you like
4 don't open the door.......... knocks at it

Answer 1

1 Wherever(whenever) they go their dog follows them. 
2 However hard he tries he can't have a "5" in History.
3 You can sit wherever you like.
4 Don't open the door whoever knocks at it.