Staff are allowed to take a ten-minute break every two hours to relax, use the bathroom or do ___________ else is necessary.
| A．something | B．anything | C．whatever | D．what |
After living in New York for 30 years, he returned to his hometown ______he was brought up by his uncle.
| A．which | B．where | C．that | D．when |
I had just started back for the house to change my clothes _____I heard my name called.
| A．as | B．for | C．while | D．when |
It is an interesting story and one can't put it down _____ one has finished reading it.
| A．after | B．when | C．since | D．until |
I have been keeping the portrait _____ I can see it every day, as it always reminds me of my childhood in Paris.
| A．since | B．where | C．as | D．if |
_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.
| A．As | B．While | C．Because | D．If |