Use should or had (to) with the correct form of the infinitive in brackets.
1. We ... (to call) on him yesterday, but we were too busy as we ... (to attend) an extra meeting. 2. I ... not (to tell) him this news; he was so much upset, but I really ... (to do) so, for the circumstances demanded that. 3. You ... (to see) him dance! You have missed a lot. I ... (to take) you to the concert. 4. It was very hard work but we ... (to do) it. 5. She ... (not to let) it pass like that, she ... (to explain) it to him that he was wrong. 6. Although it was unpleasant to her, she ... (to tell) him that he was wrong.