I doubt _______ they can complete the bridge ahead of time.
A、whetherB
这里表示的是：来的方式，要用how.
The goal of the course is to ___(rich)our understanding of other cultures.
Nowthatyouknowallthefacts，youcanmakeaninformed___(choose).
The rediscovery of this species of birds is one of the most___(ordinary)scientific findings in recent years.
要是没有你的支持，我们就完不成那项任务了。翻译
I _____him 150 dollars and must pay him back tomorrow.
