A.You mustn’t wash your hands carefully before meals.
B.You should wash your hands carefully before meals.
C.You needn’t wash your hands carefully before meals.
D.You might wash your hands carefully before meals.

A.where
B.when
C.which
D.why

A.therefore
B.besides
C.moreover
D.however

A.off
B.heater
C.has left
D.for

A.off
B.heater
C.has left
D.for

A.Using
B.to
C.his
D.on

A.Excavations
B.have revealed
C.laying
D.reconstructions

A.Richard has bought his present car for two years.
B.Richard has had his present car for two years.
C.Richard bought his present car for two years.
D.Richard had his present car for two years.

A.Richard has bought his present car for two years.
B.Richard has had his present car for two years.
C.Richard bought his present car for two years.
D.Richard had his present car for two years.

A.Schools no longer have to pay for their student's field trips.
B.Most school heads find it not worthwhile for students to spend time preparing for exams.
C.The number of field trips organized for school groups is growing.
D.Cutting field trips may mean fewer opportunities for students’ cultural learning.