E-mail , as well as cellphones, _____an important part in daily communication

73. It is not right _____ a person who is_____ trouble.

The kidnapped American captain was rescued from the Somali pirates（海盗）. — But for the help of the US Navy, he _______ freed then.

The Science Museum,_____we visited during a recent trip to Britain, is one of London’s touristattractions.

Jim is good ________soccer, and he thinks it’s good _______health.