HELP!! I. Circle the correct form of the verb:
1. Liverpool ( knew / is known ) as the city where the Beatles started.
2. What ( is made / makes) the work of a scientist important ?
3. Penicillin ( invented / was invented ) by Alexander Fleming.
4. Alexander Bell ( is constructed / constructed ) the first practical telephone.
1. is known
2. makes
3. was invented
4. constructed