Inventioncanbeasitmaysuddenlyb

Invention can be ________ as it may suddenly begin just by noticing something usual.

A．accidental	B．careless
C．necessary	D．imaginative

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Without facts, we cannot form a worthwhile opinion for we need to have a factual knowledge ________ our thinking.

A．which to base on	B．which to be based on
C．on which to be based	D．on which to base

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Shangri-la, which is _______ happy home for the local people, is also ________ home to many birds and animals.

A．the; a

B．/; /

C．a; /

D．/; a

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--- Hi, Timmy. I’m going to Kitty’s party.
--- ________.

A．Have fun

B．Take care

C．No problem

D．Best wishes

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The number of people invited ____ fifty, but a number of them ___ absent for different reason.

A．were; was

B．was; was

C．were; were

D．was; were

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In order to get good marks, he has changed his attitude ______ study.

A．about

B．of

C．to

D．on

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