There was enough evidence to prove that the explosionin Robinson’s house _______ the leak of natural gas.

Many approaches have been _______ to control thespread of H7N9 Bird Flu

The reform project _______ by Mr. White ________ atthe meeting now.

What do you have to do besides the room at home —I have to take out the trash.

When asked how to revise the plan, he _______ his own opinions and suggestions.