The black box is a necessary device on an airplane, which records its speed, direction and whether everything on the airplane______ normally.
| A．will function | B．functioned | C．is functioning | D．has functioned |
I’ll be late home tonight because something has just ______ at work.
| A．come up | B．come out | C．come over | D．come across |
There was an _________ look on his face when he knew the bad grade of his son.
| A．worrying | B．exciting | C．worried | D．excited |
The way ____ he spoke English is more like that of an American.
| A．which | B．how | C．in which | D．in that |
It wasn’t until nearly a month later ____ I received the manager’s reply.
| A．since | B．when | C．as | D．that |
As is known to all language learners, the newly learnt words will soon be forgotten unless______ used in everyday communication.
| A．gradually | B．loosely | C．exactly | D．frequently |