用“is”或“are”填空,将下列句子补充完整。 【小题1】There_______some apples on the tree. 【小题2】There_______lots of sweets in the bag. 【小题3】There_______some juice in the glass. 【小题4】There_______a pair of shoes under the bed. 【小题5】There_______a pen, three rubbers in the pencil case.