If we         now to protect the environment, we’ll live to regret it.

Peter’s parents were worried that Peter          too much time on line.

－Please ____ who broke the window.

－Are you interested in learning math?－Yes, but I         too much time on it.

--What do you usually do at the weekend?-- I ___ the program “If You Are The One” (非诚勿扰) with my family.