Little as he is, Tom, like his parents, ______ others who are in need．
A．are always helping B．has always helped
C．is always helping D．have always helped
-----I am leaving for the States tomorrow for a holiday, Caroline!
----- ．
A．All the best! B．Take your time．C．Well done! D．That’s OK．
With an online course Lynn has over 300, 000 students all over China ________her class through the Internet．
A．are attending B．attended C．attend D．attending
There is a real danger ______ the U．S will not keep its position on the world economic stage．
A．where B．that C．which D．one
The trees in that thick forest are so close together that there is hardly any room to move _______them．
A．between B．in C．among D．across
Please keep ______ secret that he has decided to give up his present position．
A．one B．this C．it D．that
