______ is known to all, Taiwan is a part of China.
| A．As | B．Which | C．That | D．What |
.
Many scientists believe that now we can study the behavior of a three-year-old child to see ____ they
will grow up to be criminals.
| A．that | B．how | C．why | D．whether |
.
One advantage of eating a balanced breakfast is _____ it can keep you energetic throughout the day.
| A．that | B．how | C．when | D．whether |
.
_____ you have a complaint to make, do something about it right away. The longer you wait, the harder it will be to get your complaint resolved.
| A．If | B．Unless | C．Though | D．Since |
.
Mary had to work at evenings and weekends. Only in this way _____ complete the reports by the deadline.
| A．was she able to | B．she was able to |
| C．she has been able to | D．has she been able to |
.
This city, _____ lies in the northeast, was the country’s busiest port from 1648 to 1950.
| A．that | B．which | C．of which | D．where |