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which makes; studying when made; to study that made; to study when is made; studying
have made having made are being made will be making
had been studying have been studying have studied are studying
which makes; studying when made; to study that is made ;study that is made ;studying
picked up set up took up made up
have made having made are being made will be making
picked up set up took up made up
using; studying use; to studying to use; to study use; studying
study studying to study to be studying
to study studying to be studying to have studied
when made；to study which makes；studying that is made；study that is made；studying
which makes; studying when made; to study that is made; study that is made; studying
have made having made are being made will be making
was studying would have been studying had been studying will have been studying
studying; to study to study; studying studying; studying having studied; to study
which makes; studying when made; to study that made; to study when is made; studying
The first astronaut who was sent to space. The first landing of manned spacecraft on the moon. Launching of the first man-made satellite. Rockets that can be used to save astronauts in space stations.
which makes; studying when made; to study that made; to study which is made; studying
to study studying to be studying to have studied
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