It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off．
| A．may | B．can | C．will | D．shall |
Juliet Roberts, ______ predicted, won the award for the Oscar Best Female Actress.
| A．if | B．once | C．as | D．when |
. Partly ______ about his lost love, he buried himself in office work.
| A．forgetting | B．to have forgot | C．to forget | D．having forgot |
Learning to care for a pet helps a child grow into an adult who feels responsible for ______
dependent on him.
| A．who | B．those | C．ones | D．whoever |
. The hotel turned us down because we didn’t make reservations（预约）, but we ______ have.
| A．might | B．can | C．must | D．should |
. Personal relationships ______ over years may be lost when we move houses.
| A．building up | B．built up | C．having built up | D．to be built up |