In the old days, most teenagers had to work for the landlord (地主) in the field to help _____ their families, because their families couldn’t _____ education for them.—What a pity!

The lesson drawn from the coal mine accidents is that safety measures are so important that we _____ take them too seriously.

Sam is a little weak in English and he has _______________ what the teacher says in class.

The twins are _____from each other. Can you tell me the ______ between them

crophone enabled them to keep intouch, in other words, it made it _____ for them to contact each other.