Complete the following sentences with the words below. Change the word forms if necessary. lighten inevitable predict device monotony innovation complex solution concentrate platform 1. It seems to be the best _________ to this problem. 2. It is difficult to ________what life will be like in the future. 3. The __________of his voice sent me to sleep. 4. This contest offers __________ a for the students to practice their speaking. 5. The engineer whom we met yesterday had worked out a new automatic________. 6. It will _______ the basket if we take out the potatoes. 7. I can’t ___________ on my work when I’m tired. 8. It is a _________ problem and it is not easy to find a solution. 9. Each of us is active in technical __________. 10.Failure was __________ because they were too careless.