__________ you go across the road, you must be careful.
A.When B.Since C.After D.Before
There _________ a pen, two pencils and many kinds of books on the desk.
A.are B.is C.were D.has
Many children start to learn to play _____________ piano at an early age.
A.a B.an C.the D./
The little girl has a high _____________, she should be sent to hospital right away.
I didn’t catch the school bus and arrived _________ for class this morning.
We have to hurry up because the plane will take ________ in an hour.
