Though he has to __________ a hard time，he still holds a positive attitude towards life.
| A．go through | B．look through |
| C．go by | D．see through |
The scientist’s many years’ careful observation ____ a surprising discovery.
| A．ran into | B．began with | C．led to | D．came from |
Don’t come and see me today – I’d rather you ____ tomorrow.
| A．to come | B．come | C．came | D．coming |
It is clear that your ____ English will greatly improve if you can practice ____ wherever you can.
| A．speaking; speaking | B．speaking; spoken |
| C．spoken; speaking | D．spoken; spoken |
This means going back to the place where we left the family ____ in a tree the night before.
| A．to sleep | B．to be sleeping | C．slept | D．sleeping |
Most birds find it __
__ to sleep in the trees.
| A．was safe | B．safe | C．to be safe | D．being safe |