We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
------What do you think of the opinion?------ None has given me______ piece of advice.
Why________ you always leave your dirty clothes in the bedroom?
“ Have you ever been to Beijing?” “No, but I wish I________.”
He felt______ duty to work for human rights and progress.
Was it in 1997______he was still at middle school_______ this boy became an expert at computer?