___ the employees' working efficiency, the supervisor will allow them to have a coffee break.
| A．Improving | B．To improve | C．Having improved | D．Improved |
We learned a lot from her father, an engineer ___ does research ___ science.
| A．that; into | B．whom; on | C．who; into | D．which ; on |
You should make a careful plan ___ the experiment.
| A．before to do | B．before doing | C．after to do | D．after doing |
Here’s my card, let’s keep in ___.
| A．touch | B．relation | C．connection | D．friendship |
I don’t know the restaurant, but it’s __ to be quite a good one.
| A．said | B．told | C．spoken | D．talked |
--Don’t you like the material? –Yes, it ___very soft.
| A．is feeling | B．felt | C．feels | D．is felt |