__________ medical science has achieved control over several dangerous diseases, what worries us is that some of them are returning.
| A．Since | B．Unless | C．However | D．Although |
---I went to the History Museum last summer. ----Did you go ___?
| A．else anywhere | B．to anywhere else | C．to else anywhere | D．anywhere else |
He is ill, and he has ___ in bed for a week.
| A．lay | B．lied | C．laid | D．lain |
We’ve made up our mind to finish this experiment no matter ___ difficult it was.
| A．what | B．when | C．how | D．how much |
His doctor suggested he ___ smoke because of his illness.
| A．wouldn’t | B．didn't | C．wasn’t | D．not |
---It’s a wonderful party.—It’s very nice of you to come.___.
| A．Please do make yourself at home | B．Please enjoy yourself |
| C．Help yourself | D．Have a good time |