Scientists have achieved a major ___ in the search fora cure for cancer, ____ is good news for those who suffer from cancer.

The ship would have sunk with all on board ______ for the captain.

It,s freezing cold today．You might as well put on your overcoat_____the bad weather

e can find so many good things, such as useful information and lovely pictures on the web, __________ it is also a global village filled with bad things.

A teacher may also make a mistake if he or she is not _______.