I didn’t quite follow him because he explained the theory _____that is too abstract for me.
They were having an argument about __________ turn it was to do the cooking.
His son has __________ the running of his company, including six London theatres.
The new road is __________ of the old one.
The possibility __________ pleasant smells might reduce pain has recently been suggested by new research.
Thanks to _____ help from his teachers and classmates, he has made _______ rapid progress in his studies.