Playing on a frozen sports field sounds like a lot of fun. Isn't it rather risky，__________？
| A．though | B．also |
| C．either | D．too |
There is clear evidence _____ smoking does harm to our health.
| A．where | B．what | C．which | D．that |
I was lying in bed last night when I felt the house______. Then everything became silent.
| A．shaking | B．shakes | C．shook | D．to shake |
I doubt______ he will come to attend our school’s 107th anniversary ceremony.
| A．that | B．whether | C．what | D．how |
---Tom’s been sent to the USA for further study. What about his twin sister?
--- _____.How lucky they are!
| A．So has she | B．She is too | C．So is she | D．So she has |
–Will you go camping this weekend?
--Good idea! As we know, going camping in spring ______us less tired.
| A．make | B．made | C．makes | D．has made |