【单选题】Some of the students have already learned enough English to _____ a conversation with an English speaker.
【判断题】全球粮油产量在播种面积不断减少的情况下仍然不断增长,主要得益于单产的提高。
【单选题】Teachers should _____ their students to practice _____ English as much as possible.
【单选题】Our English teacher often asks us_________ English _____in class.