—Now that you like the house with a garden，why not buy it?
—Well，I can’t afford ________ house at present.
| A．that expensive a | B．a such expensive |
| C．that an expensive | D．a so expensive |
The internet has made ____ possible for everyone to talk with friends miles away.
| A．that | B．this | C．one | D．it |
The _________ at the military academy is so rigid that students can hardly bear it.
| A．convention | B．confinement | C．principle | D．discipline |
I remembered _____ the door before I left the office, but forgot to turn off the lights.
| A．locking | B．to lock | C．having locked | D．to have locked |
Teachers required that all the students ___ their homework all alone.
| A．must finish | B． would finish | C．had to finish | D．finish |
His favorite food is fried snack and soft drinks. ______ is no surprise that losing weight is just his dream.
| A．There | B．It | C．As | D．What |