It was required by the headmaster that all the students _____at the meeting. [ ]

Nowadays people sometimes separate theirwaste to make it easier for it ______. .

One third of the houses ______ destroyed when a terrible earthquake struck the city last night.

Jim______ singChinese songs very well now, but he______do it last year.

The questions the reporter asked sometimes were ________ and they made me ________.[ ]