I’ve been waiting for him for （）hour and （） half. A: a.../ B: an... a C: an.../

I’ve been waiting for him for ______ hour and ______ half. A: a.../ B: B. an... a C: C. an.../

It is no exaggeration to say that, to an... easily ___________.

He had lost all that dreamy vagueness an... his place in life .

Convertible note is essentially a/an... A: equity B: debt C: neither equity or debt D: both equity and debt

complete the sentences with either an adjective or an adverb.用形容词或副词填空。 Another symptom is an...(irregular) heart rate.

球对称带电黑洞(R-N黑洞)有内、外两个视界面。外视界[imgclass="an...>M时,视界和单向膜区消失,奇点裸露出来