Leave your key with your neighbor _______ you lock yourself out one day.

During gene rearrangement, the δ gene of the TCR can ________. A: leave out the D region entirely B: wind up with one D region C: incorporate two D regions D: "leave out the D region entirely" and "wind up with one D region" E: "wind up with one D region" and "incorporate two D regions" F: "leave out the D region entirely", "wind up with one D region" and "incorporate two D regions"

16.With time running out fast, he only had one option ________ to him now. A: leaving B: leave C: left D: to leave

18. You had better ____________ teasing these newcomers, for that will hurt their feeling.A) leave out B) leave for C) leave off D) leave behind A: leave out B: leave for C: leave off D: leave behind

No one ________________ this building without their permission. (was to leave / is to leave)

(Be sure) to put out the light (before) you (leave). Yes, I'll (put out it). A: Be sure B: before C: leave D: put out it

When words _____, music begins. A: leave away B: leave off C: leave out D: leave alone

No one _____ the building without the permission of the police. A: to leave B: is about to leave C: leaves D: is to leave

I learned to ______the background noise. A: let out B: get out C: leave out D: tune out

构造训练数据集和测试数据集的常用方法有（ ）。 A: 保持法 (hold out) B: 交叉验证法 (cross validation) C: 自助抽样法 (bootstrap) D: 留一法（leave one out）