.The boy told his father that he would rather ______ an astronaut.a. become b. to become c. becoming d. became
Evidence has been found through years of study _____ children’s early sleeping problems are likely to continue when they grow up.
The singer’s flight was _____ due to bad weather, resulting in the show _____.
As the family did not make a(n) _____ ahead of time, they had to wait at the restaurant in order to get a table.
Some people hold the view that the new machine is advanced, while others are still skeptical _____ whether it is of practical use.
According to the engineer, there remain some tests _____ before the machine is put into operation.