21.I wanted to catch ___ early train, but couldn’t get ___ ride to the station.
A. an, the B. /, the C. an, / D. the, a
22. —Excuse me, but may I leave my luggage until it’s time for me to take my train?
—Yes, of course. I’ll ___ it.
A. make use of B. keep an eye on C. take a look at D. keep watch for
23. —It suddenly ___ to me that, Joe was an experienced nurse.
—Well, I forgot it, too.
A. struck B. occurred C. happened D. hit
24. Those who like to ___ their failure with bad luck are to be defeated in the end beyond all doubt.
A. associate B. relate C. combine D. unite