— ____can we board our plane? — In twenty minutes.
A.How soon B.How long C.How often
When you go _________ the street, you must be careful.
| A．crossing | B．cross | C．across | D．pass |
I ______ an hour finishing my homework yesterday.
| A．cost | B．paid | C．spent | D．took |
The shoes are beautiful. Please ___________
| A．try it on | B．try on it | C．try them on | D．try on them |
You are too tired, please stop _______.
| A．to work | B．work | C．working | D．worked |
This is ____ bike. ______ is over there.
| A．her, my | B．hers, mine | C．hers, my | D．her, mine |