单项选择题

(All) fruit contains fiber: an orange provides seven, (a apple five), and a banana four, but (half of) a grapefruit (provides) six grams.（）

A. All
B. a apple five
C. half of
D. provides

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单项选择题

It is sometimes difficult （） you have just met.

A．to make pleasant conversation among people
B．making pleasant conversation to people
C．making pleasant conversation for people
D．to make pleasant conversation with people

单项选择题

It is no good （） remember grammatical rules; you need to practise what you have learned.

A．trying to
B．to try to
C．try to
D．tried to