When did the scientists start working on a successor to the shuttle?

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play playing plays played

did he start; she realized he started; did she realize did he start; she had realized he started; had she realized

when we started when did we start when we will start when will we start

do; start will; start had; started did; start

when we started when did we start when will we start when we will start

when did I work…I realized when did I work…did I realize when I work…did I realize when I worked…did I realize

did he start; she realized he started; did she realize did he start; she had realized he started; had she realized

were ; paid off did; pay back did ; pay off did ; pay for

when we started when we will start when did we start when will we start

when will your course start when your course will start when your course started when did your course start

when did I work…I realized when did I work…did I realize when I work…did I realize when I worked…did I realize

did he start; she realized he started; did she realize did he start; she had realized he started; had she realized

when we start when did we start when we will start when will we start

when we start when did we start when we will start when will we start

when your course will start when will your course start when your course started when did your course start

When did the show start How did the show start Where did the show start Why did the show start

when did you start dancing when you started dancing when do you start dancing when you start dancing

does; start will; start did; start is; starting

when did I graduate; I realized when did I graduate; did I realize when I graduate; did I realize when I graduated; did I realize