The computer system suddenly while he was searching for information.
| A．broke down | B．broke out | C．broke up | D．broke in |
I don’t know who invented _____ iPhone, but I think it is____ useful invention．
| A．the; a | B．the; the | C．an; the | D．an; a |
Mr. Li, who _____ his whole life to education, is retiring next month.
| A．devoted | B．is devoting | C．has devoted | D．had devoted |
________ your dog with me should be a good choice. Trust me and I’ll look after it well.
| A．When you left | B．Leaving | C．If you leave | D．Leave |
Although the medicine can cure you ______ your illness, it has a bad effect ______ you.
| A．for ; in | B．for ; on | C．of ; on | D．of ; at |
People often think they are energetic and healthy and don’t need exercise. _______ , I have to warn that it is completely wrong.
| A．However | B．Therefore | C．Otherwise | D．Meanwhile |