The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _________explanations are hard to find.
alternative
aggressive
ambiguous
apparent
-Peter, please send us postcards ______ we'll know where you have visited.
-No problem.
but
or
for
so
Samuel, the tallest boy in our class, ______ easily reach the books on the top shelf.
must
should
can
need
I was wearing a seatbelt. If I hadn't been wearing one, I ____.
were injured
would be injured
had been injured
would have been injured
I hate it when she calls me at work-I'm always too busy to _____ a conversation with her.
carry on
break into
turn down
cut off
You are waiting at a wrong place. It is at the hotel ____ the coach picks up tourists.
who
which
where
that