In the following words，which underlined letter has a different sound from the others？（ ）
| A． |
drum |
B． |
husband |
C． |
pull |
______on the grass． It's a rule of the park．（ ）
| A． |
Step |
B． |
Don' t step |
C． |
To step |
﹣﹣﹣Excuse me， will the flight arrive soon？
﹣﹣﹣Yes， It will be landing right______．（ ）
| A． |
at times |
B． |
in time |
C． |
on time |
﹣﹣﹣What did you learn in geography class yesterday？
﹣﹣﹣I learned that the sun______in the east．（ ）
| A． |
was rising |
B． |
rises |
C． |
rose |
______useful advice you gave us!（ ）
| A． |
What |
B． |
What a |
C． |
How |
We are all______little Mary because she won the first place in the piano competition．（ ）
| A． |
thankful to |
B． |
interested in |
C． |
proud of |