题目内容

Some learning difficulties ______ from the way children are taught at school.

A. rise
B. raise
C. arise
D. arouse

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_ they are faced with is __ they should continue the work or not.

A. What; whether
B. What; that
C. When; if
D. When; why

Limit your _______ to what is necessary.

A. extend
B. expend
C. expenditure
D. expensive

surprised me _ he couldn’t speak English.

A. That; that
B. What; what
C. What; that
D. It; that

It is known that hydrogen _____ (be) the lightest element.