Every ________ has been tried but without much success.
A. means
B. mean
C. meanings
查看答案
Beijing, the Capital of China, has ________ now.
A. large populations
B. large population
C. a large population
They have given us a lot of valuable ________.
A. information
B. informations
C. informing
He did ________for his examination.
A. a little prepare
B. little preparation
C. little preparations
In modern age, electronics ________ very fast.
A. have been develop
B. has been developing
C. had been developing
微信支付 
支付宝支付