1.Their pens are (in the pencilcase).对括号内部分提问 2.My uncle lik

答案与解释：
1.Where are their pens?
in the pencilcase（在文具盒里）是个地点,所以提问用where.特殊疑问句由疑问代词+主谓倒装的句子组成,所以把剩下的句子成分中谓语系动词ARE提前变成答案.
2.What does my uncle like?
the red drawer（红色的那个抽屉）是个物品,所以提问用what.后面同上,主谓倒装,likes是实义动词,第三人称单数,一般现在时,所以提问时前面加助动词DO,变成第三人称单数DOES.