Amazing it is, an astronaut’s superior position is filled with potential danger.
| A．when | B．if | C．unless | D．as |
With a lot of problems _______, the principal decided to hold a meeting to have a discussion about them
| A．to solve | B．being solved | C．solving | D．solved |
He made up his mind to devote his life _____ pollution ______happily．
| A．to prevent; to live | B．to prevent; from living |
| C．to preventing; to live | D．to preventing; from living |
—What did your parents think about your decision?
—They always let me do _____ I think I should.
| A．when | B．that | C．how | D．what |
Tricks are often ______those who don’t look clever or smart
| A．laughed at | B．greeted | C．played on | D．made to |
The little boy _____on the mat ____ to his parents that blackbirds had _____their eggs on Mars．
| A．lay; lying; lied | B．lied; lied; lied |
| C．laid; laid; laid | D．lying; lied; laid |