介绍:
○let○ Please let him put up the flag.
○live○ We live over by the slope.
○may○ She may not want to eat the crust.
○of○ All of them are in that trunk.
○old○ How old is that frog over there?
○once○ All at once, he went down and broke.
○open○ Open the clam to see what is there.
大家还在听
