Autumn comes _____ (before / after) summer.
句意：秋季在夏季之后。根据常识可知秋季在夏季之后，用“after 在……之后”，故选 after。
2018年12月，张阿姨把4000元的存入银行，定期三年，年利率是2.75%到期后，应得利息______元.
What do you often do _____ (at / in) weekends?
We will go to the cinema _____ (in / on) Sunday evening.
Do you know _____ (why / what) you are studying for?