The law about banning using thin plastic bags came into_____from 1st Jane this year.
| A．existence | B．power | C．sight | D．effect |
One of the world’s largest art galleries is the Louvre, ______ in Paris, which is also famous for its restaurants and theatres.
| A．locating | B．located | C．to locate | D．to be located |
It is amazing that the little boy can swim ______the river ______100 meters wide.
| A．across; measuring | B．over; measured |
| C．across; to measure | D．through; measuring |
In order to meet the deadline, Professor Smith along with his assistantsthe project day and night.
| A．work on | B．works at | C．is working on | D．are working on |
Although dragon doesn’t exist, we still take it as a _______ of our nation.
| A．example | B．sign | C．mark | D．symbol |
Baseball requires teamwork _______ tennis is an individual sport.
| A．while | B．when | C．yet | D．although |