单项选择题

Speak louder so that you can make yourself _______.

A．heard
B．to hear
C．hearing
D．have been heard
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单项选择题
You are welcome to order the goods now. But payment should be made________.
A．for advance
B．from advance
C．in advance
D．to advance
单项选择题
The scientists are trying to find out the facts to _______ their theory.
A．support
B．carry
C．design
D．raise
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