The school was _______ in 1929 by a Chinese scholar.
A. established
B. placed
C. imaged
D. made
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The task will not be fulfilled ___________we get help from the other departments.
A. if
B. unless
C. since
D. when
Vitamin B enables the body to _____________ full use of the food we taken in.
A. make
B. reach
C. put
D. bring
The new traffic rules will become ________ from the first day of 2019.
A. comfortable
B. excellent
C. challenging
D. effective
下面属于C51合法标识符的是( )。
A. include
B. main
C. PSW
D. R_5