All passengers are expected to fasten the seatbelts when the plane takes off and lands.
| A．on the board | B．on board | C．on a board | D．on boards |
I was really anxious about you. You _______ home without a word .
| A．mustn’t leave | B．couldn’t have left |
| C．needn’t leave | D．shouldn’t have left |
Please find some books that _____________ these matters.
A. light upon B. give light upon
C. throw light upon D throws light upon
It has been two years we left school.
| A．since | B．when | C．before | D．as |
----I
usually go there by train.
----Why not _________by boat for a change?
| A．to try going | B．trying to go | C．to try and go | D．try going |