— Did Jack come back early last night?
— Yes. It was not yet eight o’clock ______ he arrived home.
| A．when | B．before | C．that | D．Until |
After two months’ training，the astronauts are ________to adapt to the conditions of weightlessness.
| A．accustomed | B．coming | C．realized | D．succeeding |
I smell something ________ in the kitchen.Can I call you back in a minute?
| A．burning | B．burnt | C．being burnt | D．to be burnt |
I thought the girl nice，pretty and honest ________ I met her.
| A．first time | B．for the first time | C．the first time | D．by the time |
Nowadays，scientists are working hard to find a best way of treating addictions ________ drugs.
| A．of | B．in | C．on | D．to |
It was so ________ having to sing in public.
| A．embarrassed | B．embarrassing | C．nervous | D．embarrassingly |