Some plants are so difficult to grow that they can only ______ in a perfectly clean environment.
| A．communicate | B．exchange |
| C．survive | D．afford |
The system is designed to give students easy ______ to the digital resources of the library.
| A．passage | B．way | C．approach | D．Access |
One of the most important problems we will have to solve is ____of students’ learning method.
| A．that | B．this | C．what | D．Which |
The house is nice, but ______ too small for a family of five.
| A．rarely | B．fairly | C．rather | D．Pretty |
______ from what he said, he must be the thief who has stolen the car.
| A．Judging | B．Judged | C．To judge | D．Judge |
They were surprised that a child could work out the problem ______ they themselves couldn’t.
| A．once | B．while | C．then | D．If |