So little known _____ that soldiers had to ask for a guide.

Some of you may have finished unit one. _______, you can go on to unit two.

_________ the end of this year, they will have learned l,000 English words.[ ]

What a nice model ship! – Thank you. It _________ me a few days to make it.

Would you go swimming with us? —____, but I’m very busy now.