1. 在图书馆请保持安静。 Please ________________________________________ in the library. 2. 这台机器有问题。我们最好修一修。 ________________________________________ the machine. We'd better mend it. 3. 小孩子总是怕黑。 Children are always ________________________________________ the dark. 4. 我过去常常和他一起去公园。 I ________________________________________ with him. 5. 昨晚直到妈妈叫他去睡觉,杰克才停止看电视。 Jack ________________________________________ go to bed last night.