He started to learn English in 1990 and in the years ________ he kept on using it in his work.
The man and the horse _____ fell into the river were drowned.
The question is very important. It really needs _______.
Follow the directions on the bottle carefully when _______.
Do you think ______ important _______ us to learn a foreign language?
-----I think it _______ to smoke . ------ _______.