It’s quite normal to    ten percent of the cost of a building for a period of six months or so, in case faults are found in it.

I was impressed _______ his huge feet ________ approximately 1 foot 8 inches.

I was still sleeping when the fire _______, and then it spread quickly.

The government has decided to give preference to those environmently-friendly business and companies in all aspects in _______ of sustainable development.

Nowadays, many teenagers__________ themselves to the computer games, which made them ___________ from the society.