In 1942, Columbus and his crew arrived ________ was so-called the New World by the westerners.
| A．what | B．in which | C．where | D．in what |
To qualify John for this new job, I recommended that he ____ some online courses first.
| A．will take | B．took | C．take | D．must take |
Walking alone in the dark, the boy whistled to ___ his courage.
| A．hold up | B．keep up | C．set up | D．take up |
Sleeping pills _____ be taken sometimes for a good night’s sleep but not so often that it becomes a habit.
| A．must | B．can | C．should | D．need |
I have no idea about what colours look good ____my skin.
| A．against | B．for | C．to | D．in |
_____with care, one tin will last for six weeks.
| A．Using | B．Use | C．Used | D．To use |