（1）、⑴It seems such a (浪费) to leave the food behind.
⑵Finally, I found my key at the   (底部) of my school bag.
⑶The suspect was seen  (进入) the Building at 7 p.m. last night.
⑷It was   (粗心) of Ricky to leave the door unlocked when he went to bed.
⑸The students were learning about various  (机器人) When Michelle Obama visited.

（2）、⑹After (consider) the plan carefully, the boss agreed at last.
⑺Though it's my (four) time to come to Tibet, I am still deeply attracted by the scenery.
⑻When Xi Jinping arrived in Henan province, villagers there all greeted him with (excite).
⑼—You should throw away all old files, envelopes, and other (important) things. —You're right. I need to keep my office clean and tidy.
⑽— I had two (tooth) pulled out this morning.
—I'm sorry to hear that.