You look so tired tonight. It is high time you_________.
| A．went to bed | B．went to sleep | C．go to bed | D．to sleep |
--Do you know what caused the accident? --- No, not yet. The matter _____.
| A．is being looked into | B．was being looked into | C．looked into | D．is looked into |
A new museum is being built in our city and it’ll be accessible to the citizens when___ next year.
| A．completing | B．is completed | C．to be completed | D．completed |
Robert failed to complete his education____ he found it hard to focus on his studies.
| A．although | B．if | C．because | D．while |
We live in a society_____ there is a great deal of debate about competition.
| A．which | B．where | C．when | D．that |
--- What have you learned from your experience in Japan?
--- Well, meeting people from another culture ___ be very difficult.
| A．must | B．can | C．should | D．shall |