Do you know the boy ________ is sitting next to Jim? Yes. He is Jim’s friend. They are celebrating his ________ birthday.

Sandy: How was your vacation in America? Linda: It couldn’t be worse! I don’t want to talk about it!

I phoned you at six yesterday afternoon, but nobody answered.—-I _______ a walk with my parents near the river.

Look! Someone is cutting a tree on the moon.–It _______ be true, Granny. Our teacher says there is no air there.

Five _______ students from different schools took part in the English contest last Saturday.