The mother used to ________her son’s pockets while he was asleep, looking for letters from his girlfriend.
| A．pick out | B．go through | C．deal with | D．look into |
______ their service, the workers of the hotel are active in learning English.
| A．Improving | B．To improve |
| C．Improve | D．Having improved |
_____ the flies out, we had to shut all the doors and windows.
| A．Keep | B．To keep |
| C．Keeping | D．Having kept |
_____ late in the morning, Mr. Smith turned off the alarm.
| A．Sleep | B．To sleep |
| C．Sleeping | D．Having slept |
______ French well, she went to France to live with his cousins.
| A．Study | B．To study |
| C．Studying | D．Having studied |
To test eggs, _____ them in a bowl of water: if they float they’re bad, if they sink they’re good.
| A．put | B．putting |
| C．to put | D．to be putting |