第1个回答 2010-07-28
I think I'd better try my best to learn English
第2个回答 2010-07-28
I think i should better do my best in english learning.
第3个回答 2010-07-28
I think I have to study hard to learn English .
第4个回答 2010-07-28
1.I suppose I must spare no efforts to learn English.
2.I make up my mind to learn English well.