vi. to make a very loud, deep sound; n. a loud deep sound made by an animal, especially a lion, or by sb. 's voice
A. rug
B. soil
C. roar
D. rear
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n. a person who is an expert in a particular area of work or study
A. specialty
B. specimen
C. substance
D. specialist
n. a type of solid, liquid or gas that has particular qualities
A. substance
B. shilling
C. shortcoming
D. submarine
n. a piece of information, or a story, that people talk about, but that may not be true
A. rumour
B. realm
C. spear
D. remedy
n. the position, especially a high position, that sb. has in a particular organization, society, etc. ; v.to give sb. /sth. a particular position on a scale according to quality, importance, success, etc. ;to have a position of this kind
A. rank
B. soil
C. ratio
D. spray