Question

you should look up the word in the di.tionary

You should look up the word in the dictionary when you are___of its spelling．（sure）

Answer 1

答案：unsure．
根据You should look up the word in the dictionary when you are--of its spelling．（sure），可知当你不确定这个词的拼写时，你应该查一下字典．这里根据You should look up the word in the dictionary，可确定对单词的书写应该是不确定．这里放在be动词后面应该用形容词．unsure，形容词，不确定的．故填unsure．