China recently tightened its waters controls near the Huangyan Island to prevent Chinese fishing boats from _______ in the South China Sea.

 —Is Alice still performing?—I'm afraid not. She is said _______ the stage already as she has become a director.

He was puzzled by this phenomenon. He began to try every approach _________ the best way of working it out.

The traffic problems we are looking forward to seeing         should have attracted the government’s attention.

The meeting __ tomorrow will be of great importance. All of us should attend it.