Pieces of bamboo or wood ________ books between 2nd and 5th century AD.A. used to formed B. used to formC. were used to form D. used to beforming
Up to now, Marin _____in the library for about two hours.
Recently, there have been many occasions ______ you have attended events on your own.
In front of our house ________ we used to swim.
--Don’t worry, Mum. The doctor said it was only the flu. --_______! I’ll tell Dad there’s nothing serious.
--Can you tell me why more and more people choose to shop in a supermarket? --Because it offers a greatof goods.