He was knocked down by a car ____ he saw it run toward him.

______ you read it, you can’t imagine how moving the story is.

The second Sunday of May is ______Mother’s Day. It’s ______special day for children to show their love for theirmothers.

Would you likesomething____

Not knowing how to grow crops，the primitive people had no ______ but to gather the fruit and hunt animals for food.