6．Things are much l________ when they are on the moon. 　　　　

　　5．The b________ year of the twenty-first century is 2001.

　　4．One of the bad t________ in my mouth was pulled out by the doctor.

　　3．Don’t get off the bus u________ it stops. 　　　

　　2．People think we look the same, but I can see that we have a few small d________.

　  1.We are together most of the time. So we never feel l________.