—David has made great progress recently.—_____, and _____.
He has few friends and often feels lonely , _______he has much money.
I will go to Hangzhou sometime next week. Perhaps I _____visit you at that time.
In class , our teachers always stand______ us in order to hear us clearly.
-- The population of Zhengzhou is much than that of Shanghai.
--- What volunteer work would you like to do ?--- I ’d like to _______the sick people in the hospital .