The old engineer's eyes still shone bright in the wrinkled brown face and his step as he came across the room was,though slow.
Lately some scientists are experimenting ___________ white mice to ____________ this kind of medicine.
When the reached the top of the hill ,they _______________ so they had to stop for a rest.
John ____________ his students is playing basketball on the playground.
He does ___________________ that he cannot spare no time to play with his children.
.He has __________________ the surroundings & now he is getting well on with his classmates;______________,he is treated as a normal student in the school.