参考答案：

Yes, structure drills are valuable pedagogical activities in language learning. With large classes, drills are of particular use in that they can maximize students’ participation. A one-word cue on the part of the teacher can elicit a complete utterance from the students and an enormous number of such utterances can be produced within the space of two minutes. With judicious mixing of choral and individual drill, each student can have the chance to respond productively about five times a minute in classes of twenty students or fewer. However, drills should be used judiciously, if over used, students will get bored.