Read paragraphs A-C and choose the right answe
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The lessons are usually over (at three o'clock.

The day (on) which the President of the United States is inaugurated is the 4th of March every leap year.

She is a very punctual person. Something very special must have happened to prevent her from coming (in//on) time.

The new product line must be launched (by) 1st June. 

Mr. Frederick is busy (at/ the moment. You can leave him a message and he will call you back as soon as he is free. 

I've been waiting for Tom (since/) 6 p.m.; I wonder if he's lost his way.

My daughter did so well in her studies that she graduated from high school (at) the age of 18.

I tried to persuade him but (/at/ the end I gave up. 

If we ever go camping again, it's going to be (in/) summer, not autumn.

Jill started a new job a few weeks ago. Before that she was out of work (/for) three months.

She has every intention of completing this project (for/ a week.

Mr. Hutchinson is 63. He'll be retiring from his job (over/ two years' time.

Why don't you come for a drink (on) Saturday evening?

I'm going on a three-day study trip tomorrow. I'll be away (until/ Monday.

She felt a certain obligation towards him because of everything he had done for her (in/ the past.

She has been sitting and waiting for the mail to arrive (-/ all day long.

Prices in the shops have hit the roof (over) the last few weeks.

We got to the airport (/on) time to have a coffee before checking in.

A notice at the door reads "Opening hours: (from/ 9 a.m. (till/ 5.30 p.m."

This practice of changing the clocks twice (-) a year is a real pain. Many of us take the best part of a week to recover, especially (during/ spring when we "lose an hour".

Giant Panda             
 
My favorite animal is a giant panda. Pandas live in a very small mountain region in central China. This area has plenty of rain, mild summers, and cool winters. The climate is good for the bamboo plant, which grows densely in the mountain forests. And this is good for pandas.         

Although most bears are omnivores, pandas are herbivores. They spend about 12 hours every day eating bamboo! Why so much? It’s because bamboo isn’t very nutritious and their digestive systems can’t digest it well. So pandas have to consume huge amounts for their bodies to absorb enough nutrients.         
 
In order to eat bamboo, pandas have developed certain adaptations. One adaptation is flat molars that help pandas grind the plant material. Pandas also have a long bone that extends from their wrist, which allows them to better grasp bamboo shoots and leaves.         

Nobody knows for sure why the pandas eat bamboo instead of other plants. But some scientists think it is because bamboo grows so densely, and the pandas don’t have to compete with other animals for it.