Advances in using genes as well as nanotechnology make it likely __humans will live in the future beyond ____has been possible in the past.
| A．that ,which | B．what, that | C．that ,what | D．where , what |
—Flight 331______.I’d better be on my way.Goodbye.
—Bye.Happy landing!
| A．was announced | B．is being announced |
| C．has announced | D．is announced |
My daughter often makes a schedule to get herself______of what she is to do in the day.
| A．remind | B．to remind |
| C．reminded | D．reminding |
There are so many books!It is not easy for us to decide what to take and what to______.
| A．take on | B．pick up |
| C．leave behind | D．work out |
A model or an experiment in a science class can help students see things which would ______ remain hidden.
| A．otherwise | B．still | C．thus | D．therefore |
How to balance the government's budget without raising taxes is a ______problem.
| A．firm | B．tough | C．secure | D．stable |