Solar power holds great promise for the future but methods of collecting and concentrating sunlight are as yet (5) ________, as are methods of harnessing wind power.

Thanks to the Internet, (5) _________ a foreign language has been much easier than ever before.

Additionally, learners are (4) _______ to find out information about different cultures to improve their language knowledge.

Today, (3) ___________, besides the offline class they can access many sources of learning materials on the Internet with countless videos and digital files.

To be precise, they mostly received lessons from their teachers or (2) ___________ books, and sometimes from magazines and newspapers with limited topics.

When the clock begins to strike, the head of the family (5) _______to the front door, opens it wide, and holds it until the last stroke.

People invite their friends to their house (4) ______“sit the old year out and the new year in”.

But six days later, (3) ______New Year’s Eve, the Scots begin to enjoy themselves.