After a month of training, he became __________ to the work as a high-speed train driver.
In fact, I wonder _________ my efforts were all in vain.
Cloning plants is straightforward while cloning animals is _____________ more complicated.
The doctor recommended that you ____________ swim after eating a large meal.
Only a small percentage of the graduates ___________________ a job.
– What do you think of my sofa? -- Well, great! But don’t you think it will _____________ too much space?