Mercury and Venus are the only planets which have no ________.

This new home security system is an _____ one when you need.

The ______ shifts show us that there was water on Mars.

The new generation Golf is an ________ one with its easy-to-use technology.

NASA has sent a new ______ to listen for Marsquakes.

Are you _________ to the Internet yet?

The Moon _______ the earth slowly.

Newton put forward the law of ________ in 1687.

________ usually cannot be observed directly and they emit no light.

Nokia 5510 is an ______ mobile phone these days.

To start this type of machine you should ________ first.

RTÜK is a kind of governmental institution which implements _______ on media.

The space is a ______ thing like a brain.

A _______ is a transient astronomical event that causes the sudden appearance of a bright star.

Ineffective _________ is so risky in case state secrets become known by enemies.

The sun ________ hot.

It's known that _________ affects people's mood like wolves.

-I should see ________ for my broken computer today.

A huge dust storm has __________ the spacecraft on Mars.