The chairman thought necessary to invite Professor Smith to speak at the meeting.
Such good use has been____ his spare time_____ his English has improved a lot.
----_____ would you like your coffee, black or white?--Black,please. I always prefer coffee with nothing in.
---Excuse me, what time is it now?--- Sorry, my watch______. It____ at the shop.
Dry weather______the peasants’harvest this year.
This is a______ but extremely difficult technology in the future.