When we talk about the _____we not only mean the sun, he earth and the moon but also _____ That is too far away to be seen.
They are building the dam in __________ with another firm.
(2012·上海) The club, __________ 25 years ago, is holding a party for past and present members.
(2012·山东) After completing and signing it, please return the form to us in the envelope __________.
"It’s sucha nice place," Mother said as she sat at the table __________ for customs.
—Did you have any difficulty catching yesterday's lecture? —No. The professor spoke very clearly to make his speech easy __________.