The new tax would force companies to energy-saving measures．

____are you staying in Ottawa–About two weeks.

It cost me 30 yuan to get here—Well, it was crazy of you to take a taxi _______ you could come by bus as well

Whatever is left over may be put into the refrigerator，________ it will keep for two or three weeks.(2011·安徽)

What are youdoing—- I’m ________ my English book.