When the sky is blue and the sun is shining, you may say to your friends "____________"

We had to turn _______ their invitation to lunch as we had a previous engagement. 

Choose the word or phrase among A, B, Cor D that best fits the blank space :
Meal times are generally set aside for periods of friendly get-togethers, and evenings often ……… the crew settling down to watch the latest DVD movies.

I am the first person to be interviewed, _____?

Hardly he had got downstairs when phone stopped ringing yesterday afternoon

Chemical compounds with Barium, Cobalt, and Strontium are esponsible to many of the vivid colors fireworks.

The weightlifter who allegedly took performance drugs have been named today.

The symptoms of diabetes in early stages are slight that people don’t notice them

He warned me to make an eye on my luggage that place was full of thieves

Drying food by means olar energy is a ancient process applied wherever food and climatic conditions make it possible.

I put my new book of zoology here on the desk few minutes ago, but I cannot seem to find it.

The professor is thinking to go toconference on conservation next month.

In the 1800’s store owners sold everything from a needle to plow, trust everyone, and never took inventory.

Margaret Gorman, she was the woman chosen as Miss America, died in 1995 at age of ninety.

Identify the error in each sentence: Despite there are some disadvantages, the potential of alternative sources of energy is great.

It was Mary Anderson, an amateur invention, who first patented windshield wipers automobiles

Light can travel from the Sun to Earth in eight minute and twenty seconds.

The library at university is new and has taken her name from the wife of the first president of university.

He rarely goes to the market, ______?

Men and women in the Peace Coips work with people in developing countries to help them improving living conditions.

My city stops flow of water, creating a reservoir and raise the flow of water.