Make all necessary changes and additions to produce a complete sentence from each of the following sets of words and sentences

Make all necessary changes and additions to produce a complete sentence from each of the following sets of words and sentences.
pupils / not manage / finish / all / exercise / this morning //
It / time / for us / close / shop. / Please, / back / another //
Would you / mind / lend / me / book / you / buy / last week? //
The drummer / loud / that / we / not hear / singers / clear //