We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
It’s really difficult to ______ what he is trying to express.
We all felt a sense of ______ when we saw so many overseas Chinese coming back safe and sound from Libya.
Scientists say it may be five years ______ it is possible to test this medicine on human patients.
Last month, the Japanese government expressed their thanks for the aid they ______ from China.
If you _____ smoke, please go outside because this is a non-smoking office.