1 the office is cleaned every evening at 5 p.m
2 trees are being planted in the wood by volunteers
3 america was discovered in 1492 by Columbus
4 the plants has been watered
5 a Nobel prize would be awarded him
6 this hotel should be renovated by them
7 the "illiad"was written by homer
8 your bedroom must be cleaned tonight
9 radio was invented in Russia by popov
Bikes were being ridden at 7 o'clock yesterday morning