I tried several ways to work out the math problem, but of them worked．
Never give up． I believe you'll make it．（ ）
A．allB．eachC．noneD．neither
﹣3﹣D printing could be used to build a house in less than 24 hours．
﹣It amazing．It's my first time to get to know this．（ ）
A．soundsB．smellsC．tastes
It is necessary people to have food and water every day．（ ）
A．ofB．forC．with
﹣This camera is too expensive．Do you have any others？（ ）
﹣Sorry，but that's the one．
A．biggestB．longestC．cheapest
﹣The water in the glass is sweet．Did you put any in it？（ ）
﹣Yes．I added some to it just now．
A．sugarB．saltC．oil
﹣Is that apple tree？（ ）
﹣Yes．My father planted it in 2008．
A．aB．anC．the