Вставьте нужные формы: 1. the phone while his hometask. a. talked, doing b. were talking, was doing c. was talking , were doing 2. oh, i m sorry, i haven’t at first. a. understanding b. understood c. understand 3. he was so tired that he couldn’ . a. to join b. joined c. join 4. we .the result when we finish our experiments, a. to be discussing b. to discuss c. discuss 5. to the theater this month. a. are not b. have not been c. were not