Complete the sentences. Use the past simple affirmative and negative forms of be and can.
1 He ________ open his front door because his keys ________ in his pocket. He was very angry!
2 Her glasses ________ broken, so she ________ read the newspaper very easily.
3 He ________ drive a car when he ________ ten! He's a fast learner!
4 The students ________ go to school because the road ________ open. They were very happy!
5 Our homework ________ very easy, so we ________ do it in half an hour!
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