It is no use ______ your past mistakes. A: A.regretting B: B.regret C: C.to regret D: D.regretted

decline（） A: A.to politely refuse B: B.to politely receive C: C.to politely apologize

He’d like ______ with you. He wants some help. A: to talk B: B．tell C: C．to say

He could not guess how they managed ______. A: A.doing this B: B.to doing this C: C.to do this D: D.to doing this

The Greens enjoy _______ photos．They always go out with their camera． A: A．take B: B．took C: C．to take D: D．taking

6． She spends two hours________ the violin every day． A．play B．plays C．to play D．playing

conceal（） A: A.to bring great interests B: B.to help others C: C.to hide, to keep from being seen

Our physics professor went_______two days ago. A: A.to abroad B: B.in abroad C: C.to the abroad D: D.abroad

Would you mind ______ down and wait for a few more minutes？ A: A.sitting B: B.to sit C: C.to have sat D: D.sit

The sign on the wall of the library says, “No magazine is allowed ______ out of the reading room”. A: A．being taken B: B．to take C: C．to be taken D: D．taking