We do not know how astronauts can ____ when they spend months in space without the protection of the atmosphere.
| A．get off | B．get up | C．get along | D．get in |
Her behavior is __________.
| A．worthy praise | B．worthy to be praised |
| C．worth to be praised | D．worth being praised |
—The room is so dirty, _____ we clean it?
—Of course.
| A．will | B．shall | C．would | D．do |
There are many kinds of birds in Australia, and over 140 species of snakes, ______are extremely dangerous.
| A．many of those | B．many of that | C．many of which | D．many of what |
_____ makes a new invention such a wonderful thing is ____ it allows us to do something ____ we could not do before.
| A．What; what; what | B．That; that; \ | C．What; that; \ | D．That; what; that |
Over the past 40 years, 29 other Chinese people ____ Mount Qomolangma successfully.
| A．climbed | B．have climbed | C．had climbed | D．climb |