The scientists recommend that studies ________ to find out what side effects the medicine might cause.
-How about the book you are reading now?-Excellent indeed. You can find many problems we have come across __________ in it.
If it had rained even a drop, things would be much better now and the crops in the fields __________.
A lot of people often forget that oral exams __________ to test our communicative ability.
Every year a flood of farmers arrive in Shenzhen for the money-making jobs they __________ before leaving their hometowns.
Most students expect __________ more review classes before the exams.