Green represents________and nature. When you feel weak, you can wear green.
| A．sadness | B．purity |
| C．joy | D．energy |
Hold on to your dreams, _______ they will come true one day.
| A．but | B．and |
| C．so | D．or |
Tom realized that he ________ his physics book at home when he reached school.
| A．left | B．had left |
| C．was leaving | D．leaves |
In Sweden, people don’t need to _______ too much money on presents, instead, making a meal is enough.
| A．spend | B．take |
| C．pay | D．cost |
-- Can we make this plan a week later?
-- No, we can’t put off _______ it because the meeting is only two days from now.
| A．to make | B．making |
| C．make | D．made |
--When _____ the abacus _____? -- In the sixth century by the Chinese people.
| A．is, invented | B．did, invent |
| C．was, invented | D．does, invent |