We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
He is the man _________ you can turn when you are in trouble.
Look at the timetable (时刻表). Hurry up! Flight 4026 _______ off at 18:20.
Do you have any difficulty ______ these flowers? I’d like to help you if you need.
Although he lived ____ in a ____ mountain village, he didn’t feel ____ at all.
Our teacher told us that there ______ no end to learning.