Complete the sentences with a passive form of the verb in brackets 1. cakes …………………… (make) from flour. 2. we lived in a caravan in the garden while our house ……………….. (was building). 3. all the windows ………………………… (have cleaned) this week. 4.these )when we arrived.

1. cakes are made from flour. 2. we lived in a caravan in the garden while our house was being built. 3. all the windows have been cleaned this week. 4. these cups were broken when we arrived.

End the oil age. as was the stone age, which lasted until all the stones are not over. (actually, no) oil as fuel for personal vehicles may end relatively soon as will rise in price gasoline and to improve the quality, convenience, pervasiveness and price of substitutes (and it's not only about biofuels, skype is also a substitute for oil, which burns, coming to a personal meeting). other vehicles (planes, ships, military equipment), may last longer, even with a very high price, because oil is a very good store of energy. but even when and if oil will disappear as a fuel, it will remain an important element of the economy as a raw material for the chemical industry. and if you already to do this, it will be too little and too inaccessible locations and types, it will remain in the ground, under water and so on, and mankind will move to other energy sources and polymers.