Question: and likewise when the system is in the upper state it tends to stay in the upper state, but sometimes moves to the lower state.
Answer: --> And likewise when the system is in the upper state it tends to stay in the upper state, but sometimes moves to the lower state.

Question: knife cup is new developed to ensure long lifetime and easier maintenance.
Answer: --> Knife cup is new developed to ensure long lifetime and easier maintenance.

Question: andy in later years treasured a note from hardy asking him to postpone his oral examination because he ( hardy ) had been asked to play in a cricket match for the trinity college servant's team.
Answer:
--> Andy in later years treasured a note from Hardy asking him to postpone his oral examination because he ( Hardy ) had been asked to play in a cricket match for the Trinity College Servant's Team.