单选题 --Let's go swimming, Linda. --It sounds good, ____ I'm too busy.

单选题 More than two million people have visited the science museum ____ it opened ten years ago.

单选题 We didn't enjoy the tour ____ the weather was terrible.

单选题 How time flies! It's almost three years ____ we met last time.

单选题 You are not allowed to enter the theater ____ you have a ticket.

单选题 You can find much ______ about the famous film star on the Internet.

单选题 Ben’s father ______ more information about the trip to America.

单选题 I was watching my favorite TV program ____ someone knocked at the door.