In this secret code each number _________ a letter of the alphabet.

[　　]

A red sky at sunset is ________ of good weather.

[　　]

________ do you call this in English?

[　　]

A bail has a gravitational pull of its own; but this is very small ________ the pull of something as large as the moon, the earth or the sun.

[　　]

The soldiers took possession _________ the enemy's fort.

[　　]

The Los Angeles basin ________ on three sides by high mountains.

[　　]

A．surrounds

B．is surrounded

C．is surrounding

D．has been surrounded

Water________ oxygen and hydrogen.

[　　]

Tianjing lies ________ the southeast of Beijing.

[　　]

When he _________ at the age of 65，the company will give him a good watch．

[　　]

Colour-blind people often find it difficult to _________ between blue and green．

[　　]