How many birds can you see in the trees?—I can see birds in them.

Who is making much noise?—It ____ be Timmy. He is sleeping now.

Jack, could you help me ________ these pictures on the blackboard? It may help us know more about the hazy weather. (雾霾) — With pleasure.

_________ are good friends. We often play together.

When did you get to know the foreigner? —_______ October 1st, 2009.[ ]