【2015·江苏】It is so cold that you can’t go outside _____ fully covered in thick clothes.
| A．if | B．unless | C．once | D．when |
As _____ matter of fact, basic gardening is so easy to achieve that even people with physical handicaps can garden.
| A．an | B．the | C．/ | D．a |
They travelled around _____ Changchun by _____ bus.
| A．the, / | B．/ , a | C．/, / | D．the, a |
John rushed out in a hurry, _____ the door _____ .
| A．leaving; unlocked | B．leaving; unlocking |
| C．left; unlocked | D．left; unlocking |
Please come to visit me if _________________.
| A．you are convenient | B．it is convenient of you |
| C．you are for convenience | D．it is convenient for you |
---Why do you look so sad?
---There are so many problems_______.
| A．remaining to settle | B．remained settling |
| C．remaining to be settled | D．remained to be settled |