Coffee is said to have_____ effects.
| A．promoting | B．stimulating | C．encouraging | D．enhancing |
【2015·浙江】If you swim in a river or lake, be sure to investigate ____ is below the water surface.Often there are rocks or branched hidden in the water.
| A．what | B．who | C．that | D．whoever |
A ship in harbor is safe, but that's not ______ ships are built for.
| A． | what | B． | whom | C． | why | D． | when |
【2015·北京】I truly believe ______beauty comes from within.
| A．that | B．where | C．what | D．why |
【2015•湖南】________ the job takes a significant amount of time, most students agree that the experience is worth it.
| A．If only | B．After |
| C．Although | D．In case |
【2015·安徽】______ scientists have learned a lot about the universe, there is much we still don't know.
| A．Once | B．Since | C．Though | D．Unless |