单选题 ____an unforgettable class it is.

单选题 ____fast the boys ran!

单选题 I learned to swim when I was young, so I ____ swim very well.

单选题 ____difficult homework we had yesterday!

单选题 Even the top students in our classs can't work out this problem, so it ____ be too difficult.

单选题 John ____ come to attend the evening class tonight, but he isn't very sure yet.

单选题 You ____ go and see a doctor at once because you' ve got a fever.

单选题 They have been working very hard, so they ____ get good results in the final exam.