______the atmosphere around our Earth, we would not be able to live.A．Had it not been forB

When a material burns in the air, heat is released and new substances are______.

A．separated

B．ruined

C．formed

D．dissolved

Fossils are the evidence of past life______in the rocks of the Earths crust.

A．revealed

B．preserved

C．reserved

D．postponed

Some argue that we are the way we are______our genes.

A．in case of

B．as to

C．in spite of

D．because of

Postage______ , the smart phone will cost you at least 3,000 yuan.

A．to be included

B．to include

C．included

D．including

Hardly had I turned around the corner and______my dog when he dashed towards me.

A．saw

B．seen

C．seeing

D．see

Hard______they tried, they failed to climb to the mountain top

A．if

B．when.

C．as

D．since

A large number of cars______parked in front of the supermarket.

A．is

B．are

C．has

D．have

I found out that I am a(n)______learner: I learn best when professors use the blackboard.

A．visual

B．audio

C．active

D．fast

Horses have more highly developed______of sight and hearing than humans.

A．senses

B．skills

C．customs

D．abilities

We have beer, whiskey, coke, and some soft drinks, so please make yourself______.

A．at home

B．at hand

C．at heart

D．at large