(2019邢台市桥东区二模)There is no doubt________ Hong Kong and Macao belong to China.
A.which B.if C.that D.whether
(2019石家庄市17中三模)He is________ from meeting. I will take a message for him.
A.busy B.absent C.proper D.different
(2019秦皇岛市海港区一模)We have________ the whole textbook. We are ready to take the exam.
A.discovered B.directed C.appointed D.reviewed
(2019唐山市路北区二模)Learning a foreign language ________ time and effort, so be patient.
A.enjoys B.follows C.requires D.remains
WeChat（微信）is one of the most convenient ways of ▲ .
A. information B. competition
C. communication D. pollution
(2019临沂改编)"Left-behind" children________ see their parents, because their parents work in the cities.
A.hardly B.often C.always D.usually
