— Is he from America? — _____. [ ] A. Ye

Mr. Wang made up his mind to devote all he could ____ his oral English before going abroad.

A．improve

B．to improve

C．improving

D．to improving

Mike ___________ a great day last weekend.[ ]

A. have

B. had

C. has

钻头喷嘴中喷射出的钻井液，对钻进过程发挥着最主要作用（）。

A.清洁、净化井底，避免重复切

B.保持和扩大预破碎带裂

C.直接水力破岩

D.冷却钻具

由斯皮尔伯格导演，以一战为背景的动物题材题片叫什么名字？

果汁喝起来方便，喝果汁可以代替吃水果。