We all find ________dangerous to skate on the thin ice.
| A．this | B．it | C．that | D．/ |
Jack was about to lock the door when he just _____ time he remember his key.
| A．on | B．in | C．at | D．by |
Don’t write the letters ______ pencil but ______ ink.
| A．with; with | B．in; in | C．in; with | D．with; in |
Children wake up very early ____ the morning of Christmas Day.
| A．in | B．on | C．for | D．at |
____ a cold winter morning, I met her in the street.
| A．In | B．On | C．At | D．For |
Why did you get up so early ___ this morning.
| A．on | B．/ | C．at | D．in |