Gramma – Thì hiện tại hoàn thành & V- ing và nguyên thể của động từ

Choose the best answer.

We ______ in Hanoi for a long time.

Choose the best answer.

Up to now, the discount ______  to children under ten years old.

Choose the best answer.Jane is a wonderful singer.

Her mother tells me that she ______  professionally since she was four

Choose the best answer.

None of the students ______ to class yet.

Choose the best answer.

A digital camera is used for _____ the pictures and video clips in electronic format instead of to film.

Choose the best answer.

People use a tooth sensor ____  any bacteria causing cavities, or any other infections in your teeth.

Choose the best answer.

Lima Billboard in Peru is used _____  clean water from Lima’s extremely humid air.

Choose the best answer.“Where’s Tony?” “He ______ to the travel agent, and he hasn’t come back.”

Choose the best answer.

I’d like to see that football match because I ______one this year.

Choose the best answer.

I can’t believe that you ______all the three exercises. You just started five minutes ago.

Choose the best answer.

Tom often watches TV after his parents ______ to bed.

Choose the best answer.

Their children ______  lots of new friends since they ______  to that town.

Choose the best answer.

He ______  off  alone a month ago, and _______ of since then.

Choose the best answer.

They often use a webcam _____ moving pictures and sounds and allowing these to be broadcast on the Internet.

Choose the best answer.

A smart watch is used _____ you access to lots of information besides the time of day, such as missed calls, messages, and emails.