She is always thinking more of herself, seldom, ____, offering to help others.
A. if never
B. it's possible
C. if ever
D. if any
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The flowers he bought will die unless ____ everyday.
A. watered
B. watering
C. being watered
D. to water
If ____ in class, you will have to clean the classroom for a week as a punishment.
A. to catch to sleep
B. caught to sleep
C. catching sleeping
D. caught sleeping
Mimosa, 15 cm in height, is a sensitive small plant, which will close when ____.
A. touching
B. touched
C. is touched
D. to be touched
Lei Feng was a person who was only too ready to help others, seldom____, refusing them when they turned to him.
A. if never
B. if ever
C. if not
D. if any