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1. If he _____ her address, he would write to her. 1)knows 2)knew 3)had known 4)has known 2. If he had been at the concert, he _____ it. 1)will enjoy 2)would enjoy 3)would have enjoyed 4)enjoys 3. If we _____ a taxi, we would have missed the plane. 1)have taken 2)hadn’t taken 3)had taken 4)has taken 4. If it were not so cold, the children _____ to the mountains. 1)would go 2)will go 3)would have gone 4)will have gone 5. I would have answered her letter long ago, if I _____ her address. 1)knew 2)have known 3)had known 4)has known