It was necessary to _____ the factory building as the company was doing more and more business.
It was not until the beginning of the twentieth century________to explore space.
A notice was________in order to remind the students of the changed lecture time.
It took________supplies to construct these energysaving houses. It took brain too.
Since you weren’t at the meeting, we the decision without you.
Internet shopping will ready when people make sure that it is safe.