单选题 He did it out of gratitude for( )she had done for him.

单选题 His job was to( )out the good apples from the bad ones.

单选题 Tom was not handsome and he was not brilliant, but( )he worked hard and was loyal to his boss.

单选题 The city was named( )the first president of the U.S., who decided upon its location in the first place.

单选题 He's a nice person, ( ), but not very competent as a manager.

单选题 Can you( )a minute for me after today's work?

单选题 She told her children that they must not, ( ), play with matches.

单选题 I must admit my whole heart is( )being a medical biologist.