Jim______ sing Chinese songs very well now, but he______do it last year.
A：can; can't
B：could; can't
C：can; couldn't
D：could; couldn't
精准扶贫不能光喊口号，一定要真抓实干，这就要求各级领导干部（ ）
①坚持法无授权不可为，坚决纠正不作为、乱作为
②积极推进政务公开，自觉接受困难群众的监督
③树立正确的政绩观，提高为人民服务的本领和水平
④树立求真务实的工作作风，探索行之有效的脱贫办法
The students are making p____ for the coming art festival.
