Since last year east African countries ________ heavy rains and widespread floods.
A.experienced B.have experienced C.were experiencing D.had experienced
The disease will be defeated as long as we ________ calm and stay strong.
A.keep B.kept C.are keeping D.had kept
Many sea animals are in danger and ________ disappear from the Earth someday.
A.must B.should C.need D.may
The opening ceremony of the event ________ in Rome on Jan. 21, 2020.
A.is held B.was held C.will be held D.has been held
Planning a trip is easy, ________ packing luggage can be a little bit difficult.
A.but B.or C.so D.for
Most people enjoy ________ their holidays in Thailand for its natural beauty and wild animals.
A.spend B.spending C.spent D.to spend
