______ is “CHINA NEWS” shown on CCTV-4? —Every day. [ ]

Why haven’t you asked her to come here?—She _______ an important experiment when I found her and she _____ it.

How much did the company donate to build the school library?— About three ______ yuan．

How time flies! It has been ten years I moved to Chongqing.

We must______ using plastic bags in order to protect our earth..