1 How happy we are ( ) each other here away from home

1 How happy we are ( ) each other here away from home
A seeing B to see C seen D meeting
2 he is so fat that the chair is not enough for him to ( )
A sit B sit on C sit down D take a seat
3 why did you buy the jacket ( ) you didn't like ti?
A since B that C which D /
4 Tom hasn't phoned us for a long time.what do you suppose ( )to him
A was happening B to happen C has happened D happened