She can’t help___ the house because she’s busy making a cake.
The president of the university arrived yesterday, __________ the start of his short visit to China.
Tom was very angry about __________ to Mary's birthday party.
—Have you considered __________ your job as a doctor?—Yes. I like the job because a doctor can give help to more people.
__________ many times, she still can't remember it.
Can you imagine what difficulty we had __________ home in the snowstorm?A walked B. walk C. to walk D. walking