_______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.
A.While | B.When | C.Since | D.if only |
---Are you going to Tom’s birthday party?
---________.I might have to work.
A.It depends | B.Thank you | C.Sounds great | D.Don’t mention it |
He had his camera ready ____he saw something that would make a good picture.
A.even if | B.if only | C.in case | D.so that |
Look over there--- there’s a very long,winding path _____up to the house.
A.leading | B.leads | C.led | D.to lead |
I'm afraid he’s more of a talker than a doer, which is ____ he never finishes anything.
A.that | B.when | C.where | D.why |
They are broadening the bridge to ____ the flow of traffic.
A.put off | B.speed up | C.turn on | D.work out |