You look so tired. You______have stayed up late again.
The schools themselves admit that not all children will be successful in the jobs ______ they are being trained.
As it turned out to be a small house party, we __________ so formally.
There was never any time for Kate to feel lonely, ________she was an only child.
Peter and Bob both did well, but Peter is ________________of the two.
______________ about wild plants that they decided to make a trip to Madagascar for further research.