Limit your _______ to what is necessary.
A. extend
B. expend
C. expenditure
D. expensive
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______ 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.
We had meant to tell her the news, but ______ (find) she wasn’t in.
The scientists have been making the experiment for half a year, but they ____ (not succeed) yet.