Without facts,we cannot form a worthwhile opinion,for we need to have factual knowledge _____

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

#98906

upon which to base

which to be based on

which to base on

to which to be based on

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Sometimes I’m dying ______ him about it.

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tell

to tell

telling

of telling

All the students were excited        that English would become an optional course.

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hearing

to have heard

heard

to hear

--- He looks so tired. What’s wrong? --- Nothing serious. He just stayed up last night, ___________his papers.

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to prepare

having prepared

prepared

preparing

Whenever you are in trouble ,don’t hesitate _____us for help.

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in asking

with asking

to ask

to asking

 Square dancing ________ to help maintain fitness has caused conflicts between the Damas and the neighboring residents.

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claiming

claimed

having claimed

to claim

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