How many lessons do you usually have aday —Sixlessons a day. And each of them _____45 minutes.

From mum’s love, patience and understanding, I have learned what a huge responsibility _____ is to raise a child. [ ]

edly, yesterday a group ofAmerican soldiers were walking along the road in Iraq when a bomb was _______,three of whom were killed．

If you sleep less than 7 hours a day, you are more to catch a cold.

It was dark when Mary went out. I wonder how she ______ through the black lane by herself.