Народ с заданием
1. Choose the correct form of the verb:
1. Today science constitutes a major tool of progress, … not it?
a) is b) has c) does
2. … our researchers have investigated the state of air and water pollutions by the end of this year?
a) are b) will c) be
3. Before the scientist returned the assistants … the new equipment in the laboratory.
a) had installed b) installed c) install
4. … the theory of chain reactions one of the major discoveries of our time?
a) Does b) Is c) Will

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