1. The children have ____ the good apples from the bad ones.
2. China sent up Tiangong-1 into space _____ on September 29th.
3. Mr. Brown was _____ to leave his hometown to make more money.
4. My sister ____ buying the short skirt because she thinks it's too short.
5. With the ____ of modem medicine, we can cure most of the eye problems.