For our middle school students, some courses are compulsory, while others are ________.
#19297
A
flexible
B
optional
C
impressive
D
significant
推荐题目
 ----Do you know the result of the ________ race? ----Yes. The winner is a boy ________ Lin Feng from Class 4.
#34831
A
100-metres, called
B
100-metre; calling
C
100-metre; called
D
100-metres, calling
 She was always _____ , even when things were at their worst.
#17965
A
attractive
B
optimistic
C
pessimistic
D
frightened
His proposal is very _____. We do not need any explanation.
#20719
A
abstract
B
faithful
C
loyal
D
concrete