The play had already been on for quite some time when we __________ at the New Theatre.
| A．have arrived | B．arrived |
| C．had arrived | D．arrive |
Before 1066, in the land we now call Great Britain lived peoples ______ two major language groups.
| A．belonged to | B．belonging to |
| C．were belonged to | D．were belonging to |
Everything a family needs to plan a party, except the cake and ice cream, ______ to the home in a large basket.
| A．delivers | B．deliver | C．is delivered | D．are delivered |
Nowadays, children always complain that their parents are out of date, ______ parents can’t approve of what their children say and do.
| A．while | B．thus | C．therefore | D．otherwise |
We know a good deal about the people who lived in China 4, 000 years ago, because they ______write and leave written records for those who lived after them.
| A．could | B．should | C．must | D．shall |
Trees are useful to man mainly in three ways, the most important of which is that they can protect ______ from droughts (干旱) and floods.
| A．it | B．itself | C．himself | D．him |