are glad to see that China--(develop)so much in the past few

has developed 现在完成时

再问： 还有一道 It is cheaper to send a text message than ___(talk) on a mobile phone
再答： to talk (根据 to send 可知答案）
再问： 最后一道，太感谢了！Michel___(be)to Tianning Temple twice since he came to Changzhou
再答： has been ( since 常与现在完成时连用）