By the end of September 2013,____.number of netizens in China has hit ___record high of 604 million.
Some researchers believe that there is no doubt _______ a cure for AIDS will be found.
To write his paper, he tried hard to collect _______ information as he could.
Don’t worry. You ________ have that book tomorrow.
Nearly all educators believe that a challenging situation can often _______ the best qualities of a person.
He found his son _______ inside the lift, _______ very worried.