There was enough evidence to prove that the explosion in Robinson’s house _______ the leak of natural gas.

A．resulted in        B．resulted from      C．led to            D．contributed to

Mr. Bryan is a/an _______ secretary in our office, for he is able to do tasks successfully, without wasting time or energy.

A．effective          B．efficient           C．flexible           D．sufficient

Mr. Andrew taught his students how to develop the basic skills in the physics class, ______ everything through jokes and experiments.

A．to explain         B．explained         C．explaining         D．explains

In that traffic accident last night the man who hit five people in a row had drunk so much that he could no longer_______ between fantasy and reality.

A．distinguish         B．disguise           C．disturb           D．disgust

We all thought that Betty could have run _______ if she had worn the sports-shoes that day.

A．even faster        B．more slower       C．much quickly       D．still fastest

In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.

A．has tried          B．has been tried      C．have taken        D．have been taken

I don’t have money or time in hand; _____, I can’t accompany you to the Parkson Mall today.

A．in a word          B．in other words      C．by the way         D．in this way

Doctor Lily has made her projects successful, so we suggest not only _______ to her old school but also give the students a talk then.

A．did she come      B．her coming        C．should she come    D．she should come

It even leaves the scientists in _______what they should call the newly born creature, which looks half-human and half-animal.

A．phenomenon      B．motivation         C．wonder           D．consequence

It’s significant for graduates to find a proper job,       in which they can bring their potential into full play not just a considerable income.

A．one              B．what             C．that              D．it