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.
