You may hurt yourself if you __________ (not be) careful.
Nobody knows what ______________ (happen) in 100 years.
When I was very young, I ________ (can  solve ) some problems by myself.
Alice, ________ (listen) to your teacher carefully.
You must spend as much time as you can_______ (read) English.
I’m looking forward to _________ (receive)my mother’s letter.
My mother and father_______ (visit) her grandparents next Sunday, aren’t they?
Now Tom with his parents   ________(plan) to visit Qingdao this summer.
It’s important _________ (learn) English well if you want to find a good job.
Can they __________ (finish) the work by themselves?