A.systemize
B.system
C.systematic
第4题
We must ______ a solid foundation for the development of our heavy industry.
A.take
B.put
C.lay
D.raise
第7题
To pronounce /θ/ and /ð/, we must pay great attention to our tongue position instead of the mouth shape.
第8题
We must keep our classroom().
A.cleaned
B.clean
C.cleaning
第10题
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