We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
The teacher called Tom to his office because he was caught_____in the exam.
The young writer_____his success to his teacher’s encouragement.
When you phoned me,I was having a meeting,otherwise I_______your call.
_________I went to the US,I visited many cities.
He_______gardening after his retirement.