It’s _____ hard problem for the twins that ____ of them can work it out.

Simon improved his way of study. ________, he has made great progress.

____ the Forbidden City is almost 600 years old, _____ it is still very beautiful.

I have __ a raincoat _____ an umbrella. That’s why I have to wait until the rain stops.

— Do you watch sports every day?
—No, I don’t. __________ I play ping-pong __________ tennis every day. So I can play them well.

______Lei Feng is no longer living, his spirit lives on today.

My father doesn’t like surfing the Internet. I don’t like it, ______.

_______ Peter is old and weak, he still has to work.

---Mum, I’m leaving for Beijing tomorrow morning.
--- Oh, good. But be sure to phone me _______ you get to Beijing, please.

______he isn’t tall,_______ he is strong.