“Underground” is the only word in the English language ____ begins and ends with the letters “und.”
—Why not watch the popular TV program “If You Are The One” (非诚勿扰)? —_________________.
If you work hard and never __________, you will learn maths well.
—Mother’s birthday is coming, I’ll make a card for her. Please keep it secret. —_____________.I won’t tell anybody about this.
Cycling isn’t _________ climbing, but both of them are interesting.
Keep on __________reading English every day, your reading skills will be improved quickly.