In my opinion we should react as soon as the plan ________ public. Waiting a day or two would put us in a rather awkward position. A. went B. will be made C. has been made D. had gone 7. The parents’ representatives wanted to know why the schools ________ of the changes in the grading system. A. haven’t informed B. hadn’t been informed C. weren’t informing D. hadn’t informed 9. Portland cement, when it ________ with water, ________ a paste that binds sand, gravel and stone into a rock-like mass called concrete. A. is combined - forms B. has combined - is formed C. was combined - was formed D. will be combined - formed 10. The twentieth century, now nearing its end, ________ the century when mankind ________ to realise that the Earth’s resources are limited. A. was - was coming B. has been - has come C. will be - had come D. had been - came 12. There were such a lot of different things to do at the resort where we ________ our holiday that none of us ________. A. spend - are bored B. were spending - bored C. spent - was bored D. have spent - could be bored 13. Cells ________ for the first time by the English scientist Robert Hooke, who, in 1665, ________ a book about his findings. A. were described - published B. would be described - could be published C. could be described - was published D. has described - had published