--- Have you thought of the topic for the composition?
---Not yet, I _______ it very carefully, but I haven’t decided.
| A．will consider | B．have been considering |
| C．had considered | D．was considering |
My friend Tom stays at Internet bars above 8 hours every day ______, really a netter(网虫).
| A．on average | B．in charge | C．up close | D．for free |
I have many friends, _____ some are businessman.
| A．of them | B．from which | C．who of | D．of whom |
____ is certain, though, is that the mystery of Tutankhamun’s tomb has never been fully explained.
| A．It | B．What | C．This | D．As |
Some time after the rockets and the space shuttle are _____, the rocket will _____ the space shuttle and ____ the sea.
| A．set sail; broadcast; drop in | B．ruled out; orbit; show up |
| C．stepped up; survive; fall for | D．launched; separate from; fall into |
London people always take umbrellas with them, just _______ it rains.
| A．in case | B．fear | C．so that | D．so long as |