Do you know who               to take part in the competition?

After Nanjing Youth Olympic Games Park ________, it will become a new tourist attraction.

---It’s difficult for the villagers to cross the river. ---I think a bridge______ over the river.

Mom, the telephone is ringing. I guess either you or Dad           on the phone.

---How often do I need to feed the birds?---They______ food every day, or they will be hungry.