_____ he met with the difficulty did he realize the importance of group work.
| A．Even though | B．Never until | C．Only before | D．Ever since |
He must have been working really hard these days. This morning, I even noticed ______ behind his ears.
| A．grey hair | B．grey hairs | C．the grey hair | D．much grey hair |
On almost all the buses in our city, there are seats ______ reserved for disabled and elderly passengers.
| A．particularly | B．in particular | C．especially | D．specially |
We’d better hurry up. The exhibition hall is a bit far from ______ we are now.
| A．what | B．which | C．that | D．where |
The old man lives alone on an island, and his home is not accessible ______ by boat.
| A．rather than | B．or rather | C．other than | D．no less than |
Do you think it ______ to attend the summer training courses run by the Sunday school?
| A．worth | B．worthy | C．worthwhile | D．worthy of |