文档介绍：单项选(30)
were the shoes with adjustable heels invented _______?
believe that those mountains_____with trees in a few years time.
covered be covered covering cover
3.—Did you go to Jack’s birthday party? —No, I________.
not invited ’t invited ’t invited ’t invite
, the milk_______strange. Do you think it’s OK to drink?
A. was tasted tasting
accident happened_______a cold winter morning.
gives people more time _____and____every day.
, play , playing work, play , to play
to the Western world____1610.
’t, until ’t, until ’t, until , until
added_____but still wasn’t_____.
, salt enough , enough salt , enough salty , salty enough
Olympic Games_____every four years.
held held holding hold
is the most helpful invention?
think do think you think
is often seen_______the old man with his help
and Edison______lights.
; discovered ; invented
; invented ; discovered
are used_____keeping off rain.
14.—Hur