This pencil is ______ that one.
| A．so long as | B．as longer as | C．longer than | D．not as longest as |
______ good knowledge of several languages is essential to _____ study of comparative literature because without it one can read books only in translation.
| A．A; the | B．A; / | C．The; the | D．/; the |
I should not have laughed if Iyou were serious.
| A．thought | B．would think | C．had thought | D．have thought |
—Shall I attend my friend's comingofage ceremony, Mum?
—No, unless you see to ________ that you will be home before 1000 PM.
| A．one | B．this | C．it | D．her |
bought three DVD copies of the film Avatar and now _ is left. Somebody just borrows something and never returns.
| A．none | B．nothing | C．either | D．neither |
Jane is in a hurry because the train to the airport leaves _______ half an hour.
| A．by | B．in | C．for | D．until |