选出句子中错误的一项,并把正确答案写在横线上。 1. Usually I come by foot. A B C ______________ 2. How do you get the USA from China? A B C ______________ 3. Slow up and stop. A B C ______________ 4. I must to pay attention to the traffic lights. A B C ______________ 5. There are many pictures for lights. A B C ______________