课时1
课上典型例题：
1. When I came in, he happened _______ on the bed _______.
A. to be lying; reading B. to be lying; and read
C. to lie; and reading D. to have lain; reading
2. They are determined to climb the mountain, ________ there are many difficulties.
A. as if B. even though C. which D. where
3. As it turned out to be a small house party, we _________ so formally.
A. needn’t dress up B. couldn’t have dressed up
C. shouldn’t dress up D. needn’t have dressed up
4.Dial 110_________ emergency.
A. in any case of B. in the case of C. in case D. in case of
