These oranges taste （ ）.
（A）good
（B）well
（C）to be good
（D）to be well
John has three sisters. Mary is the （ ） of the three.
（A）most cleverest
（B）more clever
（C）cleverest
（D）cleverer
— （ ） have you learned English? — I have been learning English for six years.
（A）How long
（B）How often
（C）How far
（D）How many
