1. [cruel] a.dull b.religious c.benevolent d.restless

2. [conceal] a.discharge b.disclose c.reject d.vanish

3. [humble] a.proud b.cheap c.huge d.firm

4. [burden] a.scrape b.unload c.tangle d.connect

5. [sow] a.harvest b.plant c.bless d.strain

答案:  c; b; a; b; a;