This is ________ article written in English. I think English is ______ useful language.
| A．a， an | B．the， a | C．an， a | D．an， an |
I usually sleep with the window open _____ it’s very cold.
| A．until | B．unless | C．when | D．if |
We have to _________our school trip till next week because of the heavy rain.
| A．put off | B．put on | C．put up | D．put down |
The light is on in Mr. Green’s room. He _______ be at home.
| A．must | B．can | C．mustn’t | D．can’t |
A new supermarketin my hometown last month.
| A．built | B．has built | C．was built | D．is building |
—Excuseme.Couldyoutellme______________gettotheairport?
—Certainly.Gostraightalonghere.
| A．howcanwe | B．howwecan | C．whencanwe | D．whenwecan |