While Helen ________ the piano，her mother came in．

While Helen ________ the piano，her mother came in．

#39922

was playing

is playing

played

plays

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When you are planting trees, the trees ________ straight in the hole.

#36844

must put

must be put

are putting

is put

Who   from America? Sandy and I_______.

#38637

is come; does

comes; do

are come; do

is; is

—Where were you last Saturday?—I ____ in the Capital Museum.

#38903

will be

was

have been

The light rail from Wuhan to Wenquan            in six months.

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will build

has built

is building

will be built

---Where were you this morning?---I _____________ in the supermarket.

#41689

will shop

am shopping

was shopping

have shopped

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