is known to us a11 is that London will host the 30th Olympic Games next

It is wise to have some money ________ for old age.

Bad news? —If you ______ know, Li Na got defeated again in the first round!

66. Is＿possible to fly to the moon in a spaceship

Now lots of teenagers spend a lot of timeplaying computer games.——Yes. Teachers and their parents shouldprevent them ______________ too much.