The government who ________ responsible for this event attempted to find a solution． were。 was。 are。 is。
The 19th Winter Games, held in Salt Lake City,________ an Olympic tradition which goes back almost 3,000 years． is the part of。 are the part of。 is part of。 are part of。
What we have to take________the courses offered only for this term． are。 is。 have been。 has been。
John________ he could improve his exam results, but he did not have enough time to study． knows how。 knows that。 knew how。 knew that。
The development of the light bulb ________partly as a result of the widespread availability of electricity and the need for cheap, clean light．
