单句语法填空
1．Though injured seriously, he tried to cheer ， hoping to make his parents less worried.
答案：up
2．Her (puzzle) look on her face suggested she didn’t understand what I said.
答案：puzzled
3．The passengers were warned to watch out thieves.
答案：for
4．New technologies have made it possible (turn) out new products faster and at a lower cost.
答案：to turn
5．As we know, getting angry not only does harm one’s health but also has a bad effect the relationship between people.
答案：to; on
6．(2018·长春质检)Some believe in the (exist) of life on Mars, while others consider it as a myth.
答案：existence
