A hot balloon blew up in Egypt. There ________ something wrong with the quality of it.
| A．may have been | B．must be |
| C．need have been | D．might be |
The young man spent as much time as he _____ over his lessons.
| A．went | B．can go | C．could going | D．could to go |
--- Who should I send this message to ?
--- The mayor is the one ___ ?
| A．to send it | B．to be sent | C．for sending | D．to send it to |
He transplanted the little tree to the garden _____ it was the best time for it.
| A．where | B．when | C．that | D．until |
Few pleasures can equal ______ of a cool drink on a hot day.
| A．some | B．any | C．that | D．those |
She is quite a different girl _____ she was five years ago.
| A．from | B．to | C．than | D．with |