______ you ever have any trouble, let me know.
| A．If | B．Whenever | C．While | D．X |
________ Yao Ming has retired from the NBA，the pleasure we have got by watching him play basketball at home and abroad will last long.
| A．Although | B．If |
| C．Since | D．Once |
________they decide which college to go to，students should research the admission procedures.
| A．As | B．While |
| C．Until | D．Once |
We should not________and laugh at those who have no homes to shelter from the rain and wind.Instead，we should be sympathetic of them.
| A．look forward to | B．think highly of |
| C．pay attention to | D．look down upon |
When you stand on the top of the mountain and overlook the surrounding scenery，you’ll find it is________to climb it up with effort.
| A．worth | B．worthy |
| C．possible | D．worthwhile |
Each time I________a good essay when reading newspapers，I cut it out and keep it.
| A．work out | B．come across |
| C．care about | D．put down |