In the botanical garden we can find a(n) __________ of plants that range from tall trees to small flowers.
| A．species | B．group | C．amount | D．variety |
33. Those who suffer from headache will find they get ______ from this medicine.
| A．relief | B．safety | C．defense | D．shelter |
They seemed ______ each other for a long time.
| A．knowing | B．to know | C．having known | D．to have known |
This is Mr. Smith. _______ help I worked out many difficult problems.
| A．whose | B．with whom | C．who | D．with whose |
---I’d like to buy a new computer.
---Well, we have several models __________.
| A．to choose from | B．to choose |
| C．for choosing | D．for choice |
____
___ to take this advance course will certainly learn a lot of useful skills.
| A．Brave enough students | B．Enough brave students |
| C．Students brave enough | D．Students enough brave |