He works hard at English ______ he can be an English teacher in the future.
Smile to the world, _______ the world will smile back to you.
----English is a global language, so you shouldn’t _______.----Thank you. _______.
He _______ go out with his parents, but now he _______ staying at home alone.
----How do you like the two pairs of shorts?----They don’t fit me well. They are _______ too long _______ too short.
________ my surprise, the twins have nothing _______ common.