Having got up late this morning, Mike ran as fast as he could _______ to catch the bus.　

 With a lot of difficult problems ________, the newly-elected president is having a hard time. 

 _______ to sunlight for too much time will do harm to one’s skin, so you should make it a rule to get your skin creamed before going out in summer.

From the dates__________on the gold coin, we decided that it was made five hundred years ago.

 When you’re learning to drive, _______ a good teacher makes a big difference.