I didn’t quite follow him because he explained the theory _____that is too abstract for me.
---- ____of them is your English teacher? ----The man wearing a blue coat.
___doesn’t seem to have been any difficulty solving the problem.
____ was in 1979____ I graduated from university.
---- Who knocked at the door? ---- I’ve no idea. I just pretended nobody was at home, so I didn’t ask who was___.
It was such a tiny village that____ knew _____else well.