—Your English is good.—Thank you. I _______ it for three years.
She has studied in this school she was seven years old.
The Great Wall is famous lots of visitors all over the world come to visit it every year.
__________ it’s very difficult, remember not to give up until the last minute.
You will never know the result ______ you try it by yourself.
________ he told the truth this time, nobody was willing to believe him because he often told lies.