That girl can _____ (sing) French songs.
句意为那个女孩能够唱法语歌。can 为情态动词，后面接动词原形。故答案为 sing。
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.
Let us go and join _____ (they).
It’s 2:00 in the afternoon. The children _____ (make) a kite.
—Whose comb is this? —It’s _____ (she), I think.