When there is a flame failure in an automatically fired auxiliary boiler, the _____.

Failure of the burner flame in an auxiliary boiler would probably be a result of .A.water

When there is a fire in a large electric motor, normally the very FIRST step is to _____.A

Only when I got there____how badly the crops had been damaged.A: did I realizeB: I rea

When I A（got to) the cinema, the film B（had already started); I C（ought to get) there D（ea

There is very little rain in this region of the country; ______, we often have crop failur

According to______ when there is a choice as to