— There is a book on the grass. Whose book is it?
— It Mike. Look, his name is on the front cover.
A．belonged to B．is belonging to
C．is belonged to D．belongs to
Only when they were put in prison and lost freedom(自由) _________ its importance.
A．they realized B．did they realize
C．realized they D．had they realized
The Internet is a very useful invention for us, ______ we can do lots of things at home.
A．with which B．with it C．for which D．for it
Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months.
A．very B．so C．such D．too
— Hi, Henry, I’m going to China for my holiday.
— China? It is a country which is well worth .
A．to visit B．visiting C．to be visited D．being visited
You should never lose ______ heart even if you are in ______ great trouble.
A．/; / B．your; / C．the; a D．a; the
