Scientists think laser (be) ____ one of the most useful tools today.
Stamp collectors have paid $16,800 for ______.
B) twelve Two Penny Blues
C) one One Penny Orange-Red
D) fourteen One Penny Orange-Reds
Who is calling to the entertainment industry to ensure their responsibility?
They are ____ and the Smoke Free Films project at the University of California in San Francisco.
个人赛羽毛球
The mistake on the locally printed postage stamps was in the ______.
B) colour
C) carelessness
D) inscription
It took three months for the two companies to reach an (agree) ___