Learning to love is like learning to walk.—Yes, we step out bravely, we’ll find it’s not so difficult.

They had a pleasant chat _____ a cup of coffee

I can’t remember _______ you started doing the work

The driver started to speed up to ________for the hour he had lost in the traffic jam.

A low-carbon(低碳) lifestyle has an effect ourdaily life. People are paying more and more attention to energiesthese days.