Which book is ______ to understand， this one or that one

______, a man who expresses himself effectively is sure to succeed more rapidly than a man whose command of English is poor.

The old lady is so weak. She________by her relatives.

50. The Englishman has a very good ear_____ music. You can ask him for some advice.

Are you free this evening? —Sorry, I’ve promised to have Mary’s radio repaired ____ for her help with my English