Let us go and join _____ (they).
句意：让我们去加入他们吧！动词 join 后“他们”用宾格，they-them，故答案为 them。
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.
It’s 2:00 in the afternoon. The children _____ (make) a kite.
—Whose comb is this? —It’s _____ (she), I think.
The students are listening to the teacher _____ (quiet) in class.