— Have you ever visited the Opera House? —Yes.When I was in Sydney, I ______ it twice.
____ to everyone the importance and value of these historic sites, the government has strengthened regulations to protect them.
The reason why I was late was that I was ______ by the traffic jam.
None of us expected that the chairman ______ at the party. We thought he was still in hospital.
The teacher simplified the reading materials, ______ it easy for the students to read.
The British team, ______ several attempts to climb Yulong Xueshan, decided to have another try this summer.