数字与名词搭配 — 英语情景题

情景对话：Sam和Tom在操场上跳绳（rope），休息时聊起了体育课用的小球。完成对话，在横线处填入正确的数字单词（英语）。 Sam: Hi, Tom! Look at the balls. Tom: How many balls do we have? Sam: We have four balls. Look, there are (1)________ balls in the box, too. Tom: Four balls and (2)________ balls in the box? That's six balls! Sam: Yes! How many balls now? Tom: Now we have (3)________ balls in all. Let's play!