I used to asking my father many questions when I was small.
Ta dùng used to + bare infinitive (động từ nguyên mẫu không to) để diễn tả hành động thường diễn ra ở quá khứ nhưng nay đã chấm dứt.
Đáp án là A: asking chuyển thành ask.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
As a millionaire who liked to show off her wealth, Mrs. Smith paid______________________________________________ we asked.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
She asked me______I was looking at.
There has been a great increase in retail sales,_____________________ ?
Education in many countries is compulsory________the age of 16.
The examination was not very difficult, but it was_____________________ long.
It is stated in the passage that____________________ .
He_______________us but he was short of money at the time.
Michael looked deeply hurt and surprised when_____________________ .