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
The ________ look on her face suggested that she _________ it. 
#18691
A
puzzling; hadn’t expected
B
puzzled; hadn’t expected
C
puzzling; wouldn’t expect
D
puzzled; shouldn’t expect
Glasses are      and must be handled with great care.
#19486
A
heavy
B
smooth
C
flexible
D
fragile
(安徽省马鞍山市2009届高三第一次教学质量检测)If you are         the thunderstorm,you’d better stay in the low-lying areas  
#20840
A
unlucky enough to be caught in
B
enough unlucky to be caught in
C
to be caught unlucky enough in
D
to be enough unlucky caught in
After a lot of questioning, Jack ______ admitted he had taken the car.
#18659
A
frequently
B
eventually
C
absolutely
D
Generously