1 We have several subjects .and I thak__English is the easiest__

1 We have several subjects .and I thak__English is the easiest__
A of which.to studj .B among which ,tobe leamed.C of those,to follow D among them to be picked up.
2 The theary be has struck__us that eathquakes can be precast
A to prove to B to proves to C proves to D which proved
3 The train was crowded and I had to get into a carriage__already seven other peaple
A when there are B which there are C that there were D where there are
4 Tomatses were not the first food __was taken to Europe .
A which B that C what D where
5 Nestmonth__you will be spend in your hometowh is corning
A which B that C when D where
6 next wonth __you will be in your hovnetown is coming
A which B that C when D where .