10 the us congress consists of
a) one chamber b) two chambers c) no chambers
a
n tods was written by​

Если вы имели в виду, что первым заданием нужно из утверждения сделать отрицание, то тогда предложение будет выглядеть так: My classmates don't organise parties at school every month.Общий вопрос: Do your classmates organise parties at school every month? Альтернативный вопрос:Do your classmates organise parties at school every month or every week? Специальный вопрос: How often do  your classmates organise parties at school? Вопрос к подлежащему: Who organises parties at school every month? Вопрос с хвостиком: Your classmates organise parties at school every month, don't they?

1. The investigation studies the marketing problems. The marketing problems are studied.
2. The author developed some theoretical models. Some theoretical models were developed.
3. We found an approach to the problem. – An approach to the problem was found.
4. The paper considered a number of standard programs. – A number of standard programs were considered.
5. The author has analyzed the material. – The material has been analyzed.
6. The author gives the important data. - The important data is given.