Entering the room,I found Mary____ at the desk and____ a letter.
It is the third time that she ______ the role of Juliet ever since she graduated from university.
Bamboo, which is a common plant in the south, is used ______ in buildings, food, furniture and so on. It is used to make clothes as well.
________ by keeping down costs will Power Data hold its advantage over other companies.
Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
More and more people have got to know the importance of the English study. ______, about six people in ten in this city are able to speak a little English.