Can you imagine what problem may ________ when human beings are cloned?
| A．raise | B．cause | C．arise | D．lead |
—What do you think of the book?
—________，it is one of the worst books I've ever read.
| A．Not at all | B．It depends | C．To be honest | D．No problem |
Our football team _____ every match so far this year, but we still have three more games to play.
| A．was winning | B．had won | C．has won | D．wins |
—How’s your new babysitter?
—We ______ ask for a better one. All of our kids love her so much.
| A．might | B．mustn’t | C．couldn’t | D．should |
The letters for the boss ______ on his desk but he didn’t read them until three days later.
| A．was put | B．put | C．has put | D．were put |
Gou-de-le, which is one of the largest supermarket Meitans, _____ some of its stores open 24 hours on Mondays through Saturdays.
| A．keep | B．have kept | C．had kept | D．keeps |