______ riding shared bikes（共享单车） is an environmentally friendly way to travel，many of the bikes are thrown everywhere．（ ）
A．AlthoughB．AsC．UnlessD．Until
"Bob，did you go interesting on vacation？""Yes，I went to Guizhou with my family．"（ ）
| A． |
anywhere |
B． |
everywhere |
C． |
nowhere |
Elephants have good memories．They can walk for a long time and never ．（ ）
| A． |
get worried |
| B． |
get mad |
| C． |
get lost |
In the evening，I either watch TV play computer games to relax myself．（ ）
| A． |
or |
B． |
and |
C． |
nor |
It is said that thirteen is unlucky number in many Western countries．（ ）
| A． |
a |
B． |
an |
C． |
the |
﹣I think wearing seat belts is very important for road safety． ﹣_____（ ）
| A． |
That's all right． |
B． |
I'm sorry． |
| C． |
That's a good idea． |
D． |
I agree． |