English is___ useful language in ___ world.
Breakfast at home is healthy and delicious, ________ I have to eat breakfast on the way to school because I can’t get up so early.
I'm afraid your dad can’t join us for lunch.He_______ a speech on Chinese art to the first-year students in the hall.
---Would you like an apple pie for lunch? I'll make it for you.---Honey, you_______.Let’s go out to have something different.
---I'm sorry I can’t find the library book anywhere.---So I'm afraid you have to_______ it.
Listen! There are some birds _________ in the tree. What a beautiful morning!