Charles was alone at home, with __________ looking after him.
There is clear evidence _____ smoking does harm to our health.
I was lying in bed last night when I felt the house______. Then everything became silent.
I doubt______ he will come to attend our school’s 107th anniversary ceremony.
---Tom’s been sent to the USA for further study. What about his twin sister? --- _____.How lucky they are!
–Will you go camping this weekend? --Good idea! As we know, going camping in spring ______us less tired.