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 |
I really appreciate ____ time to relax with you on this nice island.
| A．have | B．having | C．to have | D．to having |
John thinks it won’t be long _____ he is ready for his new job.
| A．when | B．after | C．before | D．since |
_______, you will get used to the life here and have your understanding of life.
| A．As time going by | B．With time passing out |
| C．As time goes by | D．With time goes by |
In ____, he began to learn Russian, when he was in ______.
| A．1970; the 50’s | B．the 1970; his 50s |
| C．the 1970s; his fifties | D．1970s; his fifties |
Nowadays, no single country can successfully ____ the global problems alone.
| A．make use of | B．deal with | C．come up with | D．go through |