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Ex 41 Complete the following sentences, bearing in mind the chart and the model above. 1. The students knew when the delegation (arrive) but they were ot sure if (at the appointed time). 2. We asked the weather man when the weather (change for the better) and if (remain good till the end of the month). 3. I wasn't sure if they (get to the station in that fog in time). 4. It was not clear iſ the weather (change) but what we wanted to know was if the plane (be late).