【题目】Seven ___________ (twelve) of the students have taken part in the tree-planting activity since Monday.

【题目】The mother bought the toy car her son looked forward to ________ (satisfy) him. Soon the boy no longer felt sad.

【题目】The great scientist Hawking has been dead for some time, but his achievements ________ (continue) to influence the world for many years.

【题目】Shared bikes ________ (praise) as one of "the four new inventions" in China.

【题目】Many people regret ________ (not study) hard when they were young.

【题目】The famous bookshop ________ (lie) on Changjiang Road in Changzhou in the 1990s.

【题目】Penicillin(青霉素)was first _______ by Fleming early in the twentieth century.

【题目】The most important thing is that all the tickets are ___________ (完全地) free to children under 18.

【题目】Her parents moved to Xinjiang in their ___________ (四十) and have lived there since then.

【题目】He preferred ___________(封闭) himself in and listening to music to watching TV when he was sad.