FCE open cloze sentencw

1. 51 He hadn't realised ..... they were trying to do, until he asked for an explanation.

The tribes that lived high in the mountains ..... never previously been seen.

I intend to return to education ..... that I can get better qualifications.

The houses ..... built using a new method that made them cheaper.

1. Only ..... person involved in the project got a pay rise at the end of it.