In my opinion, life in the twenty-first century is much easier than .
| A．that used to be |
| B．it is used to |
| C．it was used to |
| D．it used to be |
If you go to Xi’an, you will find the palaces there more magnificent than commonly＿＿.
| A．supposing | B．supposed | C．to suppose | D．suppose |
—— He hasn’t gone to the office up to now.
—— Well, he ＿＿＿＿＿.
| A．should | B．ought to | C．ought to go | D．ought to have |
—— Have you watered the flowers?
—— No, but ＿＿＿＿＿.
| A．I am | B．I’m going | C．I’m just going to | D．I will go |
Mr. Black, ＿＿＿＿＿ born in Kentucky, lived and practiced law in Missouri.
| A．was | B．he was | C．although | D．who he was |
All substances, ＿＿＿＿＿ solids, liquids, or gases, are made up of entirely atoms.
| A．whether they | B．whether | C．whether are they | D．whether are |