______ you may have, you should gather your courage to face the challenge.
| A．However a serious problem |
| B．What a serious problem |
| C．However serious a problem |
| D．What serious a problem |
It might __ reasonable to start the meeting at 4:30.
| A．make | B．be made | C．to make | D．made |
It's clear that the thief was seen __ into the room that night.
| A．went | B．go | C．going | D．to go |
He apologized to me ___ again.
| A．to be late | B．of being late | C．to have been late | D．for being late |
He’s lucky enough to have many people ___ him with the work.
| A．help | B．to help | C．helped | D．helping |
Everybody thoutht __ strange for a shy nab to ___ so many exciting things.
| A．this; have done | B．; have done | C．this; do | D．it, do |