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【題目】This printer is of good quality．If it _______ break down within the first year, we would repair it at our expense．

【題目】Experts recommended parents _____their children to play computer games for more than an hour a day.

【題目】Alice tried to keep calm, but her red face ______ the fact that she was nervous.

【題目】______ excuse you have, you should apologize for not having finished the task in time.

【題目】There were so many people in the hall then that I could hardly _______ my sister.

【題目】How long do you suppose it is _______ he arrived here?

【題目】--- Were you surprised by the ending of the film?

【題目】I don't think he is the suitable person，for he____experience，____is essential for the job.

【題目】I am mad when my wife insists on selling the house. I _______ she would decide that.

【題目】I was so familiar with her that I recognized her voice _______ picking up the phone.