Scientists say it may be five or six years ___ it is possible to test this medicine on human patients.
The coach asked his staff tothe large group of journalists, waiting for him to announce his training plan.
The human race has already paid a heavy price for its slow to environment threats.
Mary and I see each other ____, but not as often as we used to.
China recently tightened its waters controls near the Huangyan Island to prevent Chinese fishing boatsfrom ______in the South China Sea.
Tom was for you to come to his birthday party.