Changing a light bulb is easy. Don’t you know how ______?

換燈泡很容易。你不知道要怎麼做嗎？

______ a new computer, you can do a lot of things fast and easily.

藉著這台新電腦，你可以既快速又輕鬆地做很多事。

Why is Helen crying? Is she having problems ______ her boyfriend?

海倫為什麼在哭？她和她的男朋友出了什麼問題嗎？