112.1956年4月,毛泽东提出我国发展科学、艺术的基本方针是

24My parents never let me ( ) alone.

23( ) their homework, the children went for a walk.

22My father ( ) an invitation to a dinner party, but he ( ) it.

21 Generally, the thicker a mammal’s (哺乳动物) skin is, the less hair ( ).

20On Sundays I prefer ( ) at home to ( ) out.

19The fire ( ) two persons’ death as well as the damage of all the store’s property.

18His hard work ( ) when he won the prize.

17All ( ) is a continuous supply of the basic necessities of life.

16Susan wants to know whether the measures have been agreed ( ).

15I haven’t decided which seat ( ).