The astronaut did many experiments in the spaceship,__________________much help for knowing space.
| A．which we think it is | B．which we think are of |
| C．of which we think is | D．I think which is of |
— Who would you rather _____ your graduation ceremony tomorrow, your parents or friends?
— All of them.
| A．will have attended | B．have attended |
| C．attended | D．to attend |
In terms of the knowledge of science, few students in our class can really ______ Christopher.
| A．suit | B．compare | C．win | D．match |
Remember to pack more winter clothes into your suitcase. The winter in Chicago _____ be extremely cold.
| A．must | B．will | C．can | D．shall |
Two-fifths of people have reported that they get a sunburn ______ to “deepen” a brown skin, despite the fact that getting a painful sunburn just once every two years can increase the possibility of skin cancer.
| A．on condition | B．at present |
| C．by accident | D．on purpose |
He was always too hard on himself, never spending one single penny more. But he acted ________ when he helped the poor old lady.
| A．cruelly | B．selflessly |
| C．actively | D．actually |