1．She failed this English examination again. This is because she sometimes has trouble ____________(pay) attention to her study.
答案：paying
2．The problems ____________(discuss) at the meeting tomorrow are really hard____________(solve)．
答案：to be discussed；to solve
3．____________(remind) myself of the past pleasant days, I have some related photos pinned beside my desk.
答案：To remind
4．____________(wait) for the bus for thirty minutes, he lost his patience and felt very anxious.
答案：Having waited
5．Once____________(build), Xiong’an New Area will reduce the burden of Beijing heavily.
答案：built
6．You begin to understand how Chinese speakers have their thoughts ____________(organize), and how they understand things.
答案：organized
7．We’ve had a good start，but next，more work needs ____________(do) to achieve the final success.
答案：to be done/doing
8．The ____________(puzzle) expression on his face suggested that he didn’t understand what I had said.
答案：puzzled
9．What he said about the accident ____________(prove) completely wrong.
答案：proved
