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
The children talked so loudly at dinner table that I had to struggle ____.
A. to be heard B. to have heard C. hearing D. being heard
