1.YOU CAN GO HOME. YOU"VE FINISHED this exercise (when) ................................................................................................... 2.i dont get many opportunities to practise my english. i find it difficult to remember everything i study (therefore) ............................................................................................................................................. 3.i"m practising speaking english a lot. i dont want to fail in the oral test (because) ............................................................................................................................................... 4.the world"s energy resources are limited. we should use them economically(so) ...................................................................................................... 5.the country could face an energy crisis. Demand continues to rise (if) ............................................................................................................................... 6.you can"t borrow my dictionary. you bring it back on monday (unless) ................................................................................................................................ 7.the cost of installation is very high. solar domestic heating systems are economical to use.(but) .............................................................................................................................