第1个回答 2013-07-17
1 Smoking,which is harmful to health, is very popular nowsdays, though.
2 The way (that 或者in which或者 / ) you have done it is wrong.
3 One's native language / mother tongue is the only language that is easy (for one) to learn.
第2个回答 2013-07-17
Smoking,which is popular in the society, is harmful to our health.
The way you did it was wrong.
Mother tongue is the only language that is easy to learn.
第3个回答 2013-07-17
Smoking, which is harmful to our health, is quite popular nowadys.
The way which you do this is wrong.
The mother tounge is the only language which is easy to learn.
第4个回答 2013-07-17
Smoking,which is harmful to health ,is quite common nowdays.
The way you are doing itis wrong.
Mother tongue is the only language that one can easy master。