The vase rolled over the table, fell onto the floor and ______.
At this time tomorrow ______ over the Atlantic.
Chen Xiexia is the first Chinese athlete ______ the gold medal in the Beijing Olympic Games.
______ many times, he finally understood it.
Going on a trip into ______ space must be quite ______ exciting experience.
— I need to advertise for a second-hand mountain bike.— _______?David just plans to sell his present one.