According to school bus safety rules, when a school bus stops on the road to _____or pick up students, other vehicles behind it must stop to wait.
| A．drop off | B．take off | C．pay off | D．turn off |
– These plants ______ lack of water.
--- You should have watered them.
| A．died for | B．dead for | C．was killed | D．died |
_____ he stayed in England , he visited some of his friends.
| A．When | B．During | C．For | D．In |
You two follow me; the rest _____ where you are.
| A．stays | B．lay | C．stay | D．stayed |
Dear Jenny, thank you for your letter which ______ on April 1st.
| A．arrived | B．arrived at | C．arriving | D．arrived me |
_________, they delivered the message as quickly as they could.
| A．Arriving at | B．On arriving | C．When arriving | D．Arrived |