1 . When we use c__________ card, we’d better control ourselves and avoid buying things unwisely.(根据首字母单词拼写)

2 . As is known to us, there is a g________ gap between young and old. (根据首字母单词拼写)

3 . E______________ students are usually students who spend a few weeks or a year in a foreign country. （根据首字母单词拼写）