Put the words in brackets in the plurar.
1. (Business person) are involved in the management of (company)
2.My father builds(bridge)
3.Every year they spend a couple of (month) at the seaside
4.In our orchard we grow (potato) and (tomato)
5.This museum exhibits the 18th-century (organ),(piano) and (grand piano)
6.Why do financial (crisis) happen?
7.I want to read Shakespeare's (play), both (tragedy) and (comedy)
8.(Roof) on houses vary in geometry , method of ventilation and covering material
9.There are computer (disk) in those (box)
10. At the Geography lessons we study nature (phenomenon)