Complete the sentences with the verbs in the correct form.
1 Mary looks exhausted. What has she been doing all working day?
2 How long have they known their history teacher?
3 How many times has Tim visited Sidney?
4 Jess learn has been learning Spanish words for hours, but she still doesn't remember all of them.
5 Sorry, we are late. Have you been waiting for a long time?
6 The friends have been playing chess for several hours.
7 Yas Nina been studying for a long time today?
8 My uncle has never played curling.
9 Dave has not seen his colleagues recently.
10 Melony has been writing the report all day, but she has not finished yet.