Fit these conjunctions ( if, in case, unless, until, when) into the gaps in the sentences : We are unable to supply the goods. .... we recieved payment in advance. A spare axle is provided ...... one is damaged during routine use. The machine should not be modified ....a service engineer is present. The filter should be changed..... the unit has been in operation for two unit has been in operation for two months. The red light will come on .... the machine over heats.
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We are unable to supply the goods unless we receive the payment in advance. A spare axle is provided in case one is damaged during routine use. The machine should not be modified unless a service engineer is present. The filter should be changed until the unit has been in Operation for two months. The red light will come on when the machine over heats.
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