—Will you go to the park now? —Not until I ________ my physics exercises. 

 I ______, but I was prevent by the heavy rain.

As we stood on the top of the hill, we could see the beautiful scene that _______ before us.

When I talked with my grandma on the phone, she sounded weak, but by the time we ____ up, he voice had been full of life．

This passage had many new words and the students could not _______ what the writer meant.