In today's information age, the loss of data _________ cause serious problems for a company.
need
should
can
must
—What’s all that noise about outside? —Oh, I forgot to tell you. The road to the railway station ______.
Since the time humankind started gardening, we _____to make our environment more beautiful.
We won’t start the work until all the preparations __________.
Sofia looked around at all the faces: she had the impression that she _____ most of the guests before.
James has just arrived, but I didn’t know he _______ until yesterday.