V. Complete the following sentences with appropriate form of the words in the brackets(1pt)
1. English is an ___________________language in this country. (OFFICIALLY)
2. Thunderstorm can be __________________, while tornadoes and lighting can be life threatening.(DESTROY)
3. Due to the ______________________in the science and tchnology, impossible things have become possible things. (DEVELOP)
4. Robots save workers from performing ___________________tasks. (DANGER)
