If you keep learning English for half an hour each day,your English will be gradually improved.( )
at least
at present
at once
at first
Trees provide food and shelter and make us ______ comfortable.
Trees make our city more beautiful and ________ noisy, do you think so?
Three trees can do the job of 15air-conditioners _________ almost all day.
He gave me clothes _____ food.
— Would you like some bread, Linda? — _______ . It’s my favourite.