.Having a trip abroad is certainly good for the old couple, but it remains ___ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．seen |
Always read the_______on the bottle carefully and take the right amount of medicine.
| A．explanations | B．instructions |
| C．descriptions | D．introductions |
At the meeting they discussed three different_______to the study of mathematics。
| A．approaches |
| B．means |
| C．methods |
| D．ways |
He was chosen _________ of the company.
| A．manager | B．a manager | C．the manager | D．as a manager |
In the botanic garden we can find a（n）______of plants that range from tall trees to small flowers.
| A．species | B．group | C．amount | D．variety |
The experiment turned out to be ________, which wasn’t ______ they wanted.
| A．a completely failing; as | B．a complete failure; what |
| C．completely failure; that | D．failed; 不填 |