---They are quiet，aren’t they?
---Yes. They are accustomed ________at meals.
| A．to talk | B．to not talk | C．to talking | D．to not talking |
Facing the stress of employment, some college graduates make a popular choice ____ they will join the army.
| A．which | B．that | C．what | D．where |
How lucky he was! He ____ involved in the murder.
| A．must have been | B．can have been | C．could have been | D．would have been |
— You look pale. Did you sleep well？
— No. It was already midnight ____ I finished my homework.
| A．before | B．when | C．that | D．since |
Don’t use your cellphone — we are flying at ____ altitude of 10,000 meters and ____average speech is 678km/h.
| A．an; the | B．the; the | C．the; an | D．an; an |
— Don’t you think learning English wastes much time?
— ____. You haven’t got a proper method, I suppose.
| A．I hope not | B．Oh, I cant’t afford it | C．Not likely | D．Exactly |