Where is Lucy? —I can’t say where she is, but she have gone to meet her classmates, forthey want to go to Sichuan to work as volunteers.

On Sunday morning I helped my mother _______the cooking.

He came to my class every week, but his attitude ______ that he was not really interested in it. [ ]

Much attention should ______ the environment and fighting against pollution

Three _________ the students visited the museumyesterday.