1.ls this_____apple?No,it's____big(大的)orange 2.ls that ___pencil?No,it's____old pen

问题描述:

1.ls this_____apple?No,it's____big(大的)orange 2.ls that ___pencil?No,it's____old pen
3.That's____English book 4.look,That's____UFO

1. an, a
2. a, an
3 an
4 a