______ takes a lot of concentration and a great sense of balance to stay on it.
A. It B. This C. What D. That
The questionnaire takes ______ ten to fifteen minutes to complete and can be used along with the assessment interview.
A. mainly B. punctually C. approximately D. precisely
—Where is Mother?
—She is in the kitchen. She ______the housework all morning.
A.does B. has been doingC. has done D. was doing
Not knowing how to grow crops，the primitive people had no ______ but to gather the fruit and hunt animals for food.
A. conception B. commandC. virtue D. alternative
—Did you meet with the famous star yesterday?
—______ I had come a little earlier!
A. If only B. Only if C. But for D. For fear
A lot of children never fully ______ their mothers until it is too late.
A. urge B. appreciate C. accuse D. motivate
