Encouraged by my science teacher, I set about my studies on developing my product, I hope I will succeed in applying for a patent(专利权).
After he retired from office, Rogers _____ painting for a while, but soon lost interest.
The telephone rang at midnight, but it stopped ______ I could answer it.
The radiation amount of a mobile phone for two half-hour periods per day is equal to ___ to an X-ray for ten seconds.
If only he _____ to send that letter to my grandpa, my grandpa will come to help me. Look, I’m so helpless now.
______ he realized it was too late to return home.