It’s said that his smoking and bad eating habits ______his illness.

The teacher would rather the boy ________what she demands ________ him to set the bird ________ free .

I’d like to stay longer, I’m too busy.

The ability to make and use tools is one of the most basic characteristics of __________ it means to be human.

What the doctors really doubt is_____ my mother will recover from the serious illness soon.[ ]