----How long has Sam been skating?------He for five hours.A have been skating B has been skating C was skating D has been skated
______ news it is! We will have a trip this weekend.
--These plans are all suitable.I haven't decided which one to choose. --It's OK.You ________ plenty of time to make a decision.
--Thousands of people come to visit Qinghai Lake every year. --That's true.It has become our _______.
You will never guess ________.
It was stupid ______ my baby alone at home.