单选题 Natalie is too young to (　　) in the house without a baby-sitter.

单选题 The lawyer said Sally understood the (　　) of her action and was ready to get punishment.

单选题 As soon as the observer saw what the children were doing, and noticed they could not accomplish the (　　) task, she would attempt to help.

单选题 David’s efforts to (　　) a settlement were ended in vain.

单选题 They may employ her for the vacant position of Chief (　　) Officer.

单选题 Our group won the first prize under the (　　) of the teacher.

单选题 The secretary introduced a new (　　) to all the colleagues at the office this morning.

单选题 A well-written composition calls for good choice of words and clear (　　) among other things.

单选题 Jim was so tired that he could not work (　　) .