Those black clouds are a sure _____ that it’s going to rain.
| A．thing | B．mark |
| C．sign | D．one |
When you go outing with your sisters, you must see to ________ that they are safe.
| A．everything | B．it | C．them | D．yourself |
Eggs, meat, vegetables and other foods can easily be poisoned by microorganisms such as ______.
| A．phenomena | B．dilemma | C．diploma | D．bacteria |
— My colleague felt quite happy because his solution was closer now to ______．
— Congratulations!
| A．having adopted | B．be adopted | C．being adopted | D．be adopted |
Our company is seeking for a manager, especially ______ with creativity and imagination.
| A．the one | B．each | C．one | D．that |
She was depressed and felt totally __________ about the future.
| A．hopeful | B．hopeless | C．anxious | D．unfortunate |