We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
____ several times, the young scientist still kept on doing his experiments.
It was last October ____ they finally came back to their hometown.
My pen is missing. I can’t find ____ anywhere.
Had I learnt English well, I ____ interview for the job tomorrow.
I think the answer is right but I’m not ____ sure about it.