Even if these chemicals are still in experimental stages they to be a number one hit.A.

问题补充：

Even if these chemicals are still in experimental stages, they to be a number one hit.

A. intend

B. predict

C. arrange

D. Promise

答案：

A. intend

B. predict

C. arrange

(答案→)D. Promise

解析：考察动词。Intend 打算，想要干某事 predict 预测 arrange 安排 promise 有指望，有希望

句意为，尽管这些化学物质仍然处于试验阶段，他们有希望成为最受欢迎的。