Why shouldn't they make noise?
b) has
He has translated the text. (Present Perfect)
(Он перевел текст.)
Семь часов тридцать минут-half past seven
1. A greenhouse effect is expected to cause cooling in higher parts of the atmosphere. - сложное дополнение
2. It is necessary for people to develop an international program to study data on land, forest, atmospheric and oceanic resources. - оборот с предлогом for
<span>3. The new instruments will enable us to determine the level of pollution in our rivers, - сложное дополнение</span>