Подчеркните в каждом из предложений модальный глагол или его эквивалент. 1. Engineers are able to adapt to new requirements and overcome unexpected obstacles. 2. We should focus on this problem. 3. This kind of failure mechanism can be avoided through professional maintenance, which requires in-depth knowledge of the generator. 4. Your draft contract must be carefully studied before the final stage of the transaction. 5. You are not allowed to enter the laboratory.