【題目】I thought she was famous，but none of my friends have ________ heard of her.

【題目】Many students believe that the choice of their courses and universities should ______ their own interest.

【題目】 ______ scientists have learned a lot about the universe, there is much we still don't know.

【題目】Personally，I think modern education is ______sitting at a desk and looking at the blackboard.

【題目】The reason why he was absent from the meeting was he was delayed by the accident.

【題目】The bus we (一直等待) was too crowded, so we decided to catch a later one.

【題目】 _____the damage is done, it will take many years for the farmland to recover.

【題目】Do you believe scientists will ______ a cure for cancer in the near future?

【題目】 If you miss this chance, it may be years ____ you get another one.

【題目】Weather (permitr), we will go out for a walk.