The Johnsons must have been out, ___there is no light which can be seen in their house ton

听力原文：（A) The presenter is entering the room.（B) Some booklets have been passed out to

The old woman would have been drowned______a passer-by dragged her out of the water.A．but

They are sweating all over. They ______ in the field.A．may beB．must have been workingC．cou

–– Jackson: I’ve just heard that the tickets for Swan Lake have been sold out!–– Mari

The oil must have been used up,______the light went out.A．becauseB．forC．sinceD．as

－－－ I just heard that the tickets for tonight s show have been sold out. －－－ _______.A